Vulnerability CVE-2011-0539
Published: 2011-02-10   Modified: 2012-02-13

Description:
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.

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:N/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
None
None
Affected software
Openssh -> Openssh 
Openbsd -> Openssh 

 References:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673
http://www.openssh.com/txt/legacy-cert.adv
http://www.openwall.com/lists/oss-security/2011/02/04/2
http://www.securityfocus.com/bid/46155
http://www.securitytracker.com/id?1025028
http://www.vupen.com/english/advisories/2011/0284
http://xforce.iss.net/xforce/xfdb/65163
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