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 v4.0: 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/E:U/U:Green
CVE-ID: CVE-2011-0539
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenSSH
Affected software:
OpenSSH
OpenSSH
Detailed vulnerability description
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.
How to mitigate CVE-2011-0539
Install update from vendor's website.
Sources
- 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