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Last updated: 5/5/2016 9:51:47 AM

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National Cyber Awareness System

Vulnerability Summary for CVE-2002-0639

Original release date: 07/03/2002
Last revised: 09/10/2008


Integer overflow in sshd in OpenSSH 2.9.9 through 3.3 allows remote attackers to execute arbitrary code during challenge response authentication (ChallengeResponseAuthentication) when OpenSSH is using SKEY or BSD_AUTH authentication.


CVSS Severity (version 2.0):
CVSS v2 Base Score: 10.0 HIGH
Impact Subscore: 10.0
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Provides administrator access, Allows complete confidentiality, integrity, and availability violation; Allows unauthorized disclosure of information; Allows disruption of service

Vendor Statements (disclaimer)

Official Statement from Red Hat (05/15/2008)
Not vulnerable. This issue did not affect the versions of OpenSSH as shipped with Red Hat Enterprise Linux 3 or later. This issue did not affect the OpenSSL packages as shipped with Red Hat Enterprise Linux 2.1 as they were not compiled with S/Key or BSD_AUTH support. The upstream patch for this issue and CVE-2002-0640 was included in an errata so that users recompiling OpenSSL with support for those authentication methods would also be protected: https://rhn.redhat.com/errata/RHSA-2002-131.html

References to Advisories, Solutions, and Tools

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External Source: ENGARDE
Name: ESA-20020702-016
External Source: BUGTRAQ
Name: 20020626 OpenSSH Security Advisory (adv.iss)
External Source: OSVDB
Name: 6245
External Source: CONECTIVA
Name: CLA-2002:502
US-CERT Vulnerability Note: CERT-VN
Name: VU#369347
External Source: BID
Name: 5093
External Source: BUGTRAQ
Name: 20020626 [OpenPKG-SA-2002.005] OpenPKG Security Advisory (openssh)
External Source: XF
Name: openssh-challenge-response-bo(9169)
External Source: BUGTRAQ
Name: 20020626 Revised OpenSSH Security Advisory (adv.iss)
External Source: MANDRAKE
Name: MDKSA-2002:040
External Source: DEBIAN
Name: DSA-134
External Source: BUGTRAQ
Name: 20020627 How to reproduce OpenSSH Overflow.
US-CERT Vulnerability Note: CERT
Name: CA-2002-18
External Source: CALDERA
Name: CSSA-2002-030.0
External Source: HP
Name: HPSBUX0206-195

Technical Details

Vulnerability Type (View All)