National Vulnerability Database

National Vulnerability Database

National Vulnerability

CVE-2002-0639 Detail


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.

Source:  MITRE      Last Modified:  07/03/2002

Quick Info

CVE Dictionary Entry:
Original release date:
Last revised:


CVSS Severity (version 2.0):
CVSS v2 Base Score:
10.0 HIGH
(AV:N/AC:L/Au:N/C:C/I:C/A:C) (legend)
Impact Subscore:
Exploitability Subscore:
CVSS Version 2 Metrics:
Access Vector:
Network exploitable
Access Complexity:
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:

References to Advisories, Solutions, and Tools

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

Technical Details

Vulnerability Type (View All)

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