Use After Free in OpenBSD OpenSSH
CVE-2015-6564
Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.0 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2015/08/22/1 (mailing-list)
- lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html (vendor-advisory)
- www.securityfocus.com/bid/76317 (vdb-entry)
- www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- security.gentoo.org/glsa/201512-04 (vendor-advisory)
- kc.mcafee.com/corporate/index
- www.openssh.com/txt/release-7.0 (Vendor Advisory)
- www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- github.com/openssh/openssh-portable/commit/5e75f5198769056089fb06c4d738ab0e5abc…
- rhn.redhat.com/errata/RHSA-2016-0741.html (vendor-advisory)
Frequently asked questions
- What is CVE-2015-6564?
- CVE-2015-6564 is a high-severity vulnerability in OpenBSD OpenSSH, classified under CWE-264. CVSS score: 7.0/10. Published 2015-08-24.
- How severe is CVE-2015-6564?
- High severity. CVSS v3 base score is 7.0 out of 10.
- Is CVE-2015-6564 known to be exploited?
- 11 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.