There are no workarounds available for this vulnerability apart from disabling either the SCP server or the CLI view feature if these services are not required by administrators.
However, mitigation techniques are available to help limit exposure to the vulnerability. If any of the affected features are enabled, a successful attack will result in a blocked input queue on the inbound interface. Only crafted UDP packets destined for the device could result in the interface being blocked, transit traffic will not block the interface.
Workarounds that mitigate this vulnerability are available in the workarounds section of the advisory. Cisco has released free software updates that address these vulnerabilities. There are no workarounds that mitigate these vulnerabilities. If "debug ip tcp transactions" is enabled and this vulnerability is triggered, debug messages with connection queue limit reached will be observed. Conditions CallManager receives an inbound H. CCM closes the outbound H. Because the GW also closed the H.
Workaround Disable outbound fast start and this problem will not occur. Symptom MGCP three-way call conferencing may fail because of an abrupt onhook event at the originating endpoint.
Workaround None. Symptom Interim record is seen. Call goes through fine but wrong bytes are displayed. Workaround Disable LZS compression. Symptom Router may install duplicate routes or incorrect route netmask into routing table. It could happen on any routing protocol. Additionally, for OSPF, crash was observed.
Symptom H gateways crash under load. Conditions Multiple H calls were made simultaneously. Workaround Configuring the following CLI should prevent the crash:. Symptom The Watch button is not lit on if no watched phone for this watched DN. Ring back tone is heard when calling to this DN. Conditions No phone, no matter registered or not, is configred with the watched DN.
Conditions Using IOS image with feature variable more than 50 characters. Symptom Traceback observed when configuring credentials CLI under sip-ua. Conditions This happens when user configures credentials CLI with username length more than 32 characters. Symptom There will be traceback on configuring mls qos cos pass-through dscp in supporting interface mode.
Conditions Configuring "mls qos cos pass-through dscp" in the interface that supports the functionality. Workaround Currently, the CLI is not supported in most network modules, and thus, is invisible to the users.
Further Problem Description: Due to the buffer overflow, there will be traceback when configuring the QoS in the supporting interface. Currently, the CLI is not supported in most network modules, and thus,is invisible to the users. Conditions This problem should not affect most mail clients because Cisco is not in violation of any specifications.
Symptom router crashes due to signal Conditions Crash happens while transfering calls. Symptom Periodical crashes on with CME features. Conditions When "callmonitor scan" is configured. Workaround Turned off "callmonitor scan". DNS engine. This vulnerability may cause a router to crash or hang, resulting in a denial of service condition. There is a workaround for this vulnerability. Workaround There is no workaround. The rest of the file systems have no problem i. Conditions Load routers with problem releases.
Symptom Once policy map is configured and bandwidth is exceeded while dividing amongst the classes, re-configuration of the policy map is not possible. Conditions Create a policy map, exceed the bandwidth amongst the classes e. Workaround Don't exceed the bandwidth while configuring the policy map.
Workaround Create a view that excludes the ipRouteTable:. This view restricts the objects that the NMS can poll. Symptom A router may crash when you configure an access control list ACL that has at least ACEs about nodes that is used in policy maps that are already applied to an interface or when you boot the router after having made the configuration change.
The router keeps dropping SNMP packets. The log shows that the packets are dropped because of the input queue being full. Although the utilization is sometimes high, this could not be the root cause, as the router keeps dropping packets regardless of the current utilization. Apply this view to the RW community string. Symptom Transparent bridging into DLSw does not work. The following messages are displayed:. Workaround For a workaround, all transparent bridging commands related to dlsw can be replaced with DLSW Ethernet redundancy.
After this much time has passed, polling the rttmon mib for the probe statistics will cause the router to reload. Then the problem will not be seen again for another 72 weeks. Symptom Device running Workaround There is none. This error message can be verified in show logging output. Conditions ip http server is configured.
Workaround Configure no ip http server. The switch functionality is not affected by this error message. The problem is cosmetic. Workaround Use H Faststart. If incoming H calls need to be slow-start for video calls and calls to voicemail need to be faststart, enable H. Conditions 1. Conditions This is seen on a router running Symptom EM login username and password may be set to random values in process stack in case the actual input from the phone is in an invalid format.
Once they are in this stuck state, an incoming call to them will not ring the line, there will be no output in debug vpm sig. The problem is likely to occur when the pots leg is disconnected before the voip leg. If this occurs the port can go into this "stuck" state.
Any subsequent calls will not ring the fax machine on this port. Removing the SCCP config from the ports will prevent it from happening too.
In this type of attack, a malicious user can cause the IOS DNS server to accept a forged answer that associates a name with an IP address chosen by the malicious user. This answer ends up in the cache of the DNS server.
Conditions The above symptom is seen on a router loaded with The use of bit 0x20 in DNS labels to improve transaction identity is also recommended. This is a security issue. Symptom A busy tone is not heard when a message is received before a 4xx busy message. The bug affects both Workaround A patch is required, forcing the media off when a busy message is received. Successful exploitation of this vulnerability may result in the execution of arbitrary code or a Denial of Service DoS condition on an affected device.
Symptom CFwdAll incorrectly appears after night service is disabled. On the same dn as CFwdAll was on, night service is enabled and disabled. Workaround Remove CFwdAll via softkey or reload the router. Symptom Ping fails over the atm interface while applying Quality of Service.
Conditions When we configure the qos on ATM interfaces on the back to back connected routers the ping fails. Conditions If voice codecs are the same, but DTMF relay settings are different then no transcoding is done. But when voice codecs are different then transcoding is invoked, and DTMF is transcoded from rtp-nte to in-band. Symptom After security is enabled locale in the phone cannot be changed. Conditions Customer cannot leave security enabled and configure their locale on Cisco and Cisco do not present the issue as they have the firmware locally stored flash.
Symptom When an ephone hunt-group is configured with 'present-call idle-phon', the ephone hunt-group skips the DNs which are configured as overlay. Conditions The problem is observed under the following conditions:. Workaround Remove the 'present-call idle-phone' configuration from the ephone-hunt configuration and do not use overlaying. Symptom Wireless IP phone does not download the tones. So phone cannot generate the query for the relevant network locale file.
Workaround Complete the following steps to resolve the problem:. Along with User defined, we also need to define inbuilt network locale. For example:. Do not run 'create cnf-file' as it will again override with the system defined parameters.
Reboot the wireless phone. In case if you have issue in 'create cnf-file', then ensure to repeat all the steps mentioned above again. Symptom Answering a trunk call transferred from another phone is automatically put on hold and cannot be resumed.
Conditions The call originally came in on a trunk dn and is transferred to another extension on a phone sharing that trunk. Trunk optimization takes place. Symptom does not show the parked number when the call is parked. Extension-A completes the transfer by pressing transfer button. The SIP trunk dial-peer has same destination pattern as pots dial-peer, and pots dial-peer needs to have preference lower than SIP trunk dial-peer. Workaround Use "supplementary-service sip refer" or remove pots dial-peer with same destination pattern or make SIP trunk dial-peer preference lower than pots dial-peer.
Symptom One way audio after transfer. Workaround Try to use same codec. Symptom Wrong primary-phone observed after re-configure primary-dn of the ephone. Conditions Wrong primary-phone observed after re-configure primary-dn of the ephone.
Symptom and phones going into DND mode in Connected state. Conditions User getting incoming call on and phones. Since the softkeys do not update fast, if the user presses DND immediately after going into connected state then after going onhook the user phone would stuck in DnD mode.
Conditions The problem exists in Symptom External caller gets transferred from CUE to an internal DN number, and the ringback sent to the caller is distorted because of jitter.
Symptom Jitter or voice quality issue may occur. Conditions If there are a lot of ephones, say there are 50, monitoring same park DN, there will be same sccp messages sent to these 50 phones respectively in few mili seconds. Symptom Version Because of this, double digits can be seen in Unity and MeetingPlace. Workaround Use mgcp dtmf-relay type out-of-band. Symptom If a certificate map is changed or added to the trustpoint, the pub key cache for the peers is not cleared.
This makes it possible for a client which was connected in the past to reconnect again even if its certificate was banned by the certificate map. Conditions Only seen with IE8. Workaround IE6 can be used as a workaround. Some pages on server A automatically does a silent login to server B and gets the information required to generate reports.
When using IE8 this login information does not gets properly propagated to the backend server B which results in redirection request to the login page from server B. Symptom Tunnel sources get mixed up when tunnel interfaces are configured with serial subinterfaces as sources and the router is reloaded.
Conditions The symptom occurs only after a reload or when a saved configuration is applied to the running configuration. Conditions Phone A does a call blast by calling pilot number xxxxx. All the phones start ringing till time out 60 seconds then call lands on the final phone B.
Phone B answers the call and gets connected, then it checks for called number at Phone A. The final phone's number should be displayed. But the pilot number is displayed. Conditions The issue occurs when ICMP path jitter operation is configured on the router with invalid source address. Platform is supB with Workaround Configure the SLA operation with the right source address. Symptom Application set window scale factor does not get used by the accepted connection, instead the scale factor set by the global command ip tcp window XXXX is used.
Conditions ip tcp window XXXX configured to a higher than value. Connection has window scale enabled on both sides. Conditions The router runs into low-mem condition due to mem-fragmentation in certain voip-perf testing. It has a known work-around and is not a problem as such unless similar level of bursty traffic with the peculiar size of request is generated as used in testing.
Also, there is no support for iPhone and iPod safari browsers. Workaround Page is displayed but quality is poor. Symptom The called name is not displayed on the caller sccp phone when the call is forwarded to non-sccp endpoint ie. The called number is displayed correctly. Workaround Define the pool on the NAS or as a dynamic pool on the radius. Symptom When we load an FPM tcdf file on the router, a memory leak is seen.
However, this is a one time operation and has minimal impact. This happens in all the advanced images where FPM is used. This memory leak is not seen until we load a tcdf file. This issue is specific to the PI11 codebase. Conditions ipbasek9 is the only package enabled.
Conditions Only for SBC proxy address configuration and only if either of the addresses is zero. Symptom cme on cadvipservicesk9-mz. For example:. Symptom Queue-limit configured in ms is not displayed in show policy-map int output. Conditions This happens in a scenario where queue-limit is configured in ms in class-default. Symptom Chunk memory leaked while configuring the ip nat pool. Conditions While configuring the pool with subnet mask smaller than required length for the start and end ip address.
Symptom Using the command default dest-ipaddr for udp-echo, udp-jitter, and tcp-connect causes a device to crash. Conditions The symptom is observed with the command default dest-ipaddr. Workaround Do not use the command default dest-ipaddr. This sets the address to 0. Symptom A Cisco router may crash when configuring the object id in config-event-objlist subconfiguration mode. Conditions This symptom is observed when entering the cns config notify command.
Symptom NIOS watchdog timer times out. Conditions This symptom is observed when an MC modem is power-cycled. Workaround Reload the router. Workaround Once the phone state changes, it will reflect the real state to the blf sessions. Symptom The CME does not process the incoming sip message. Conditions Call forward scenario where incoming sip messsage is received. Workaround Configure : voice service voip no notify redirect ip2ip. The IOS version is Workaround Use earlier IOS such as Remove voice source-group configuration.
Conditions Happens when the CME is loaded with Workaround Call will flow through. Symptom User can not press the button configured as trunk-dn monitor to pick up the parked call. Or user cannot press the button configured as M button to speed-dial. Conditions Pressing the monitor button, no OP. Symptom Not able to configure call-forward system redirecting-expanded.
Conditions Not able to configure call-forward system redirecting-expanded on a router. Symptom After a license upgrade from 48 to 64 user license on a UC, the Cisco series phone registration fails with the following errors in debug ephone register output:.
The problem only occurs when the ephone tag value for this phone registration is 56 or higher. Workaround Use an ephone tag that is of lower numerical value.
Ephone 55 or lower will work. Symptom When shared line has 2 calls, and these 2 calls disconnect at the same time, the port might hang. Symptom Build failure is happening for platform images. Conditions FXO ports are members of a huntgroup where the first member port is disconnected or down. Unconfigure max-retry. Under each port, configure "timeouts power-denial 0" so that disconnected ports are moved to offhook state and will not be hunted.
Symptom CPU profiling under interrupts is not reliable. Symptom A Cisco router reloads when trying to connect to irc. Conditions The symptom is observed only in the first 36 hours following a reload. Workaround Do not connect to irc. Conditions This happens when the CLI's parser chain was moved, hence missing them on the platforms.
Need to ensure the parser chain is implemented as platform independent. Symptom Consult transfer with third party sip endpoints results in one way audio when the third party endpoint has delayed response to resume request which includes change in rtp stream parameters i. Conditions sip supplementary services refer is disabled. Symptom IP connectivity fails for the interface following extended pings from FastEthernet interface.
The show interface command will indicate that the output queue is wedged:. No indication at this time that this is specific to these images. This problem has not yet been seen on an interface in full duplex mode. Symptom Router reloads with a bus error and no tracebacks.
The installed IOS version is any Workaround There is no known workaround available. Subsequent calls through that same channel continue to fail with "resource unavailable" cause value equal to 47 even after DSP resources have been made available to handle the call.
The call must first fail with a legitimate DSP allocation error. Any call made through the same channel as the failed call will also fail. DSP allocation failures on gateway can be checked through the use of the exec command show voice dsp group all. The last line of the show command output includes a counter for "DSP resource allocation failure". This issue can also be seen in some cases upon bootup.
When a gateway is reloaded, system resources will come up with a slightly different timing. If, for example, a PRI interface comes up before the DSP resources have fully initialized, there may be a similar failure. Workaround The workarounds are as follows:. When the gateway comes back up, take the voice-port out of shutdown.
An increase of almost 10 percent in CPU utilization is observed with every voice call. Workaround Remove the AIM compression card from the motherboard. Outbound calls to the SIP provider have one-way audio. The internal IP phone can hear the remote party, but the remote party cannot hear the internal IP phone. Conditions TNP phones with firmware 8. Workaround Wait for about a minute, and the port will automatically recover back to registered. Symptom A call from a night hunt forwarded to BACD dial by an extension to an ephone call forwarding no answer to voicemail goes to the night hunt number and not the last redirected number.
The packets will appear as output drops on the ATM interface statistics. Under the PVC level, there are no drops. The ATM interface s need to be bridge-group configured. The bridge-group is in forwarding mode. Symptom The call-waiting tone will not be generated and the caller ID will not be displayed for the second call to a phone connected to a FXS port. Configuring either caller-id enable or caller-id enable type 2 on the FXS voice port will trigger this issue.
Workaround Have VG endpoints registered with first node. Further Problem Description : The activation of the callback is successful. What fails is when the callback destination becomes idle again and the VG endpoint gets notified ring.
After the VG endpoint goes offhook, the system should automatically connect to the Callback destination. This does not happen and VG endpoint gets silence. By manipulating the state of a TCP connection, an attacker could force the TCP connection to remain in a long-lived state, possibly indefinitely. If enough TCP connections are forced into a long-lived or indefinite state, resources on a system under attack may be consumed, preventing new TCP connections from being accepted. In some cases, a system reboot may be necessary to recover normal system operation.
To exploit these vulnerabilities, an attacker must be able to complete a TCP three-way handshake with a vulnerable system. This additional vulnerability was found as a result of testing the TCP state manipulation vulnerabilities. Cisco has released free software updates for download from the Cisco website that address these vulnerabilities.
Workarounds that mitigate these vulnerabilities are available. Cisco has released free software updates that address this vulnerability. Each advisory lists the releases that correct the vulnerability or vulnerabilities in the advisory. The following table lists releases that correct all Cisco IOS Software vulnerabilities that have been published in Cisco Security Advisories on March 25, , or earlier.
This vulnerability could allow valid users to retrieve or write to any file on the device's file system, including the device's saved configuration and Cisco IOS image files, even if the CLI view attached to the user does not allow it.
This configuration file may include passwords or other sensitive information. Devices that are not specifically configured to enable the Cisco IOS SCP server, or that are configured to use it but do not use role-based CLI access, are not affected by this vulnerability.
There are no workarounds available for this vulnerability apart from disabling either the SCP server or the CLI view feature if these services are not required by administrators. However, mitigation techniques are available to help limit exposure to the vulnerability. If any of the affected features are enabled, a successful attack will result in a blocked input queue on the inbound interface. Only crafted UDP packets destined for the device could result in the interface being blocked, transit traffic will not block the interface.
Conditions Cisco has released free software updates that address this vulnerability. Workaround Workarounds that mitigate this vulnerability are available in the workarounds section of the advisory.
This caveat does not affect the functionality. This behavior is seen only in the c, c, c, c, c, c, c, c, and as platforms. Symptom Loopback remote payload failed for routers.
Workaround There is no workaround. Conditions Occurs when large ping packets greater than bytes are sent to back-to-back cellular interfaces with GRE tunneling enabled. Symptom Traceback is generated during boot up. Conditions This is caused when the channel-group serial interface is configured with ip-address or np- ip-address.
Symptom The router hangs when attempts are made to modify pure ACL configuration while traffic is still flowing. The router returns back to normal if the traffic is stopped. Alternate Workaround: Configure static ARP on the router for the helper-address pointing towards the next hop. Symptom crypto isakmp key cli parser mode breakage.
Further information: Not service impacting. Symptom Router crashes when stcapp is disabled, stcapp ccm-group is removed from configuration, and then stcapp is re-enabled. Can also occur on other platforms running this Cisco IOS release.
Can also occur if stcapp is disabled and the user attempts to enable stcapp but stcapp fails to start for any reason. Conditions The symptom is observed on the platform with a T1 controller. In some releases a VRF name with more than 32 characters will get truncated to The following may occur:.
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