Vulnerability in OpenBSD OpenSSH
CVE-2011-0539
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.018 (77.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000
Affected products
- OpenBSD OpenSSH — versions 5.6, 5.7
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2011/02/04/2 (mailing-list)
- www.securitytracker.com/id (vdb-entry)
- www.securityfocus.com/bid/46155 (vdb-entry)
- kb.juniper.net/InfoCenter/index
- www.vupen.com/english/advisories/2011/0284 (vdb-entry, Vendor Advisory)
- secunia.com/advisories/43181 (Vendor Advisory, third-party-advisory)
- h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp (vendor-advisory)
- secunia.com/advisories/44269 (third-party-advisory)
- www.openssh.com/txt/legacy-cert.adv (Patch, Vendor Advisory)
- exchange.xforce.ibmcloud.com/vulnerabilities/65163 (vdb-entry)
Frequently asked questions
- What is CVE-2011-0539?
- CVE-2011-0539 is a high-severity vulnerability in OpenBSD OpenSSH, classified under CWE-264. CVSS score: 7.5/10. Published 2011-02-10.
- How severe is CVE-2011-0539?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2011-0539 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.