National Cyber Awareness System

Vulnerability Summary for CVE-2011-0539

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 Version 2 Metrics:

References to Advisories, Solutions, and Tools

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External Source: CONFIRM

Name: http://www.openssh.com/txt/legacy-cert.adv

Type: Advisory; Patch Information

Hyperlink:http://www.openssh.com/txt/legacy-cert.adv

External Source: XF

Name: openssh-certificate-info-disclosure(65163)

Hyperlink:http://xforce.iss.net/xforce/xfdb/65163

External Source: VUPEN

Name: ADV-2011-0284

Type: Advisory

Hyperlink:http://www.vupen.com/english/advisories/2011/0284

External Source: SECTRACK

Name: 1025028

Hyperlink:http://www.securitytracker.com/id?1025028

External Source: BID

Name: 46155

Hyperlink:http://www.securityfocus.com/bid/46155

External Source: MLIST

Name: [oss-security] 20110204 Re: [vendor-sec] OpenSSH security advisory: legacy certificate signing in 5.6/5.7

Hyperlink:http://www.openwall.com/lists/oss-security/2011/02/04/2

External Source: SECUNIA

Name: 44269

Hyperlink:http://secunia.com/advisories/44269

External Source: SECUNIA

Name: 43181

Type: Advisory

Hyperlink:http://secunia.com/advisories/43181

External Source: HP

Name: HPSBMA02658

Hyperlink:http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777

External Source: HP

Name: SSRT100413

Hyperlink:http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777