SSH transport layer protocol multiple large packet and field size buffer overflows

ssh-transport-multiple-bo (10870) The risk level is classified as HighHigh Risk

Description:

SSH (Secure Shell) is vulnerable to multiple buffer overflows, caused by improper bounds checking of packet sizes and fields. By sending an overly large packet or a packet with an overly long field size during SSH key exchange and initialization, a remote attacker could overflow a buffer in the vulnerable SSH client or server and cause the SSH service to crash or execute arbitrary code on the system with privileges of the SSH process.

*CVSS:

Base Score: 10
  Access Vector: Remote
  Access Complexity: Low
  Authentication: Not Required
  Confidentiality Impact: Complete
  Integrity Impact: Complete
  Availability Impact: Complete
 
Temporal Score: 8.3
  Exploitability: Functional
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

For Pragma Systems SecureShell:
Upgrade to the latest version of Secure Shell (3.0 or later), available from Pragma Systems Web site. See References.

For PuTTY:
Upgrade to the latest version of PuTTY (0.53b or later), available from the PuTTY Web page. See References.

For SecureNetTerm:
Upgrade to the latest version of SecureNetTerm (5.4.2 or later), available from the SecureNetTerm Web site. See References.

For Cisco devices running Cisco IOS:
Upgrade to the appropriate fixed version of Cisco IOS for your device, as listed in Cisco Security Advisory 2002 December 19th 23:00 GMT. See References.

For other distributions:
Contact your vendor for upgrade or patch information.

References:

Platforms Affected:

  • FiSSH SSH Client 1.0A for Windows
  • InterSoft SecureNetTerm 5.4.1
  • NetComposite ShellGuard SSH 3.4.6
  • Pragma Systems SecureShell 2.0
  • PuTTY PuTTY 0.48
  • PuTTY PuTTY 0.49
  • PuTTY PuTTY 0.53
  • WinSCP WinSCP 2.0.0

Reported:

Dec 16, 2002

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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