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Last updated: 4/17/2014

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National Cyber Awareness System

Vulnerability Summary for CVE-2011-0539

Original release date: 02/10/2011
Last revised: 05/03/2011
Source: US-CERT/NIST

Overview

The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score: 5.0 (MEDIUM) (AV:N/AC:L/AU:N/C:P/I:N/A:N) (legend)
Impact Subscore: 2.9
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information

References to Advisories, Solutions, and Tools

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External Source: SECUNIA
Name: 44269
External Source: BID
Name: 46155
External Source: SECTRACK
Name: 1025028
External Source: CONFIRM
Name: http://www.openssh.com/txt/legacy-cert.adv
Type: Advisory; Patch Information
External Source: VUPEN
Name: ADV-2011-0284
Type: Advisory
External Source: XF
Name: openssh-certificate-info-disclosure(65163)
External Source: HP
Name: HPSBMA02658
External Source: MLIST
Name: [oss-security] 20110204 Re: [vendor-sec] OpenSSH security advisory: legacy certificate signing in 5.6/5.7
External Source: HP
Name: SSRT100413
External Source: SECUNIA
Name: 43181
Type: Advisory

Technical Details

Vulnerability Type (View All)
  • Permissions, Privileges, and Access Control (CWE-264)