Permissions, Privileges, and Access Controls in OpenSSH - CVE-2011-0539
Published: February 10, 2011 / Updated: August 11, 2020
Vulnerability identifier: #VU45330
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2011-0539
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.
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.
Affected software
OpenSSH
How to mitigate CVE-2011-0539
Install update from vendor's website.
External References
- http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777
- http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10673
- http://secunia.com/advisories/43181
- http://secunia.com/advisories/44269
- 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
- https://exchange.xforce.ibmcloud.com/vulnerabilities/65163