Cisco Cisco IOS Software Release 12.2
147
Caveats for Cisco IOS Release 12.2
OL-3513-16 Rev. G0
Resolved Caveats—Cisco IOS Release 12.2(21)
A companion advisory that describes this vulnerability for products that do not run Cisco IOS
software is available at
software is available at
•
CSCed38527
A vulnerability in the Transmission Control Protocol (TCP) specification (RFC793) has been
discovered by an external researcher. The successful exploitation enables an adversary to reset any
established TCP connection in a much shorter time than was previously discussed publicly.
Depending on the application, the connection may get automatically re-established. In other cases,
a user will have to repeat the action (for example, open a new Telnet or SSH session). Depending
upon the attacked protocol, a successful attack may have additional consequences beyond
terminated connection which must be considered. This attack vector is only applicable to the
sessions which are terminating on a device (such as a router, switch, or computer) and not to the
sessions that are only passing through the device (for example, transit traffic that is being routed by
a router). In addition, this attack vector does not directly compromise data integrity or
confidentiality.
discovered by an external researcher. The successful exploitation enables an adversary to reset any
established TCP connection in a much shorter time than was previously discussed publicly.
Depending on the application, the connection may get automatically re-established. In other cases,
a user will have to repeat the action (for example, open a new Telnet or SSH session). Depending
upon the attacked protocol, a successful attack may have additional consequences beyond
terminated connection which must be considered. This attack vector is only applicable to the
sessions which are terminating on a device (such as a router, switch, or computer) and not to the
sessions that are only passing through the device (for example, transit traffic that is being routed by
a router). In addition, this attack vector does not directly compromise data integrity or
confidentiality.
All Cisco products which contain TCP stack are susceptible to this vulnerability.
This advisory is available at
and it describes this
vulnerability as it applies to Cisco products that run Cisco IOS® software.
A companion advisory that describes this vulnerability for products that do not run Cisco IOS
software is available at
software is available at
Resolved Caveats—Cisco IOS Release 12.2(21)
This section describes possibly unexpected behavior by Cisco IOS Release 12.2(21). All the caveats
listed in this section are resolved in Cisco IOS Release 12.2(21). This section describes severity 1 and 2
caveats and select severity 3 caveats.
listed in this section are resolved in Cisco IOS Release 12.2(21). This section describes severity 1 and 2
caveats and select severity 3 caveats.
The following information is provided for each caveat:
•
Symptoms: A description of what is observed when the caveat occurs.
•
Conditions: The conditions under which the caveat has been known to occur.
•
Workaround: Solutions, if available, to counteract the caveat.
Basic System Services
•
CSCea74631
Symptoms: A Route Switch Processor (RSP) that is acting as a slave may have complete packet
switching activity interrupted for several minutes. This situation may cause the RSP to permanently
pause.
switching activity interrupted for several minutes. This situation may cause the RSP to permanently
pause.
Conditions: This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.2(12d).
Release 12.2(12d).
Workaround: There is no workaround.