Datasheet

137
Release Notes for Cisco IOS Release 12.1E on the Catalyst 6500 and Cisco 7600 Supervisor Engine and MSFC
OL-2310-11
Caveats
• Symptoms: A router may crash if it receives a packet with a specific crafted IP option as detailed in
Cisco Security Advisory: Crafted IP Option Vulnerability:
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-ip-option.shtml
Conditions: This DDTS resolves a symptom of CSCec71950. Cisco IOS with this specific DDTS
are not at risk of crash if CSCec71950 has been resolved in the software.
Workaround: Cisco IOS versions with the fix for CSCec71950 are not at risk for this issue and no
workaround is required. If CSCec71950 is not resolved, see the following Cisco Security Advisory:
Crafted IP Option Vulnerability for workaround information:
http://www.cisco.com/warp/public/707/cisco-sa-20070124-crafted-ip-option.shtml
This problem is resolved in Release 12.1(26)E7 (CSCek26492)
• Symptoms: The VTP feature in certain versions of Cisco IOS software may be vulnerable to a
crafted packet sent from the local network segment which may lead to denial of service condition.
Conditions: The packets must be received on a trunk enabled port.
Further Information: On the 13th September 2006, Phenoelit Group posted an advisory containing
three vulnerabilities:
– VTP Version field DoS
– Integer Wrap in VTP revision
– Buffer Overflow in VTP VLAN name
These vulnerabilities are addressed by Cisco IDs:
– CSCsd52629/CSCsd34759—VTP version field DoS
– CSCse40078/CSCse47765—Integer Wrap in VTP revision
– CSCsd34855/CSCei54611—Buffer Overflow in VTP VLAN name
Cisco’s statement and further information are available on the Cisco public website at
http://www.cisco.com/warp/public/707/cisco-sr-20060913-vtp.shtml
This problem is resolved in Release 12.1(26)E7. (CCSCsd34759)
• Symptoms: The VTP feature in certain versions of Cisco IOS software is vulnerable to a
locally-exploitable buffer overflow condition and potential execution of arbitrary code. If a VTP
summary advertisement is received with a Type-Length-Value (TLV) containing a VLAN name
greater than 100 characters, the receiving switch will reset with an Unassigned Exception error.
Conditions: The packets must be received on a trunk enabled port, with a matching domain name
and a matching VTP domain password (if configured).
Further Information: On the 13th September 2006, Phenoelit Group posted an advisory containing
three vulnerabilities:
– VTP Version field DoS
– Integer Wrap in VTP revision
– Buffer Overflow in VTP VLAN name