CVE-2011-0539

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.

Category

5.0
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 1.72% Top 20%
Vendor Advisory hp.com Vendor Advisory secunia.com Vendor Advisory openssh.com Vendor Advisory vupen.com
Affected: n/a n/a
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2011-0539?
CVE-2011-0539 has been scored as a medium severity vulnerability.
How to fix CVE-2011-0539?
To fix CVE-2011-0539, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2011-0539 being actively exploited in the wild?
It is possible that CVE-2011-0539 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.