The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7,...

Vulnerability 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.

References

• http://www.openwall.com/lists/oss-security/2011/02/04/2
• http://www.securitytracker.com/id?1025028
• http://www.securityfocus.com/bid/46155
• http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673
• http://www.vupen.com/english/advisories/2011/0284
• http://secunia.com/advisories/43181
• http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777
• http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777
• http://secunia.com/advisories/44269
• http://www.openssh.com/txt/legacy-cert.adv
• https://exchange.xforce.ibmcloud.com/vulnerabilities/65163