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CVE-2002-1357: Multiple SSH2 servers and clients do not properly handle packets or data elements with incorrect length…

CVE-2002-1357 has a CVSS v2 base score of 10.0 (the maximum on that scale) and NVD lists 7 affected products, including Cisco IOS. Per its scoring, it can be exploited over the network, without authentication. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

Multiple SSH2 servers and clients do not properly handle packets or data elements with incorrect length specifiers, which may allow remote attackers to cause a denial of service or possibly execute arbitrary code, as demonstrated by the SSHredder SSH protocol test suite.

Severity breakdown

CVSS v2.0 10.0: AV:N/AC:L/Au:N/C:C/I:C/A:C

Access vector: Network. Exploitable remotely over the network.
Access complexity: Low. No special conditions are required.
Authentication: None. No authentication is needed.
Confidentiality impact: Complete. Total information disclosure.
Integrity impact: Complete. Total loss of integrity.
Availability impact: Complete. Total shutdown of the component.

Underlying weakness

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.

Affected products

Cisco IOS: 12.0s; 12.0st; 12.1e; 12.1ea; 12.1t; 12.2; 12.2s; 12.2t
Fissh SSH Client: 1.0a_for_windows
Intersoft Securenetterm: 5.4.1
Netcomposite Shellguard SSH: 3.4.6
Pragma Systems Secureshell: 2.0
Putty: 0.48; 0.49; 0.53
Winscp: 2.0.0