CVE-2015-6564

Description

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.

Category

6.9
CVSS
Severity: Medium
CVSS 2.0 •
EPSS 2.27% Top 20%
Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org Vendor Advisory redhat.com Vendor Advisory opensuse.org Vendor Advisory openssh.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.openwall.com/lists/oss-security/2015/08/22/1 mailing list
http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html vendor advisory
http://www.securityfocus.com/bid/76317 vdb entry
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
https://security.gentoo.org/glsa/201512-04 vendor advisory
https://kc.mcafee.com/corporate/index?page=content&id=SB10136
http://www.openssh.com/txt/release-7.0 vendor advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
https://github.com/openssh/openssh-portable/commit/5e75f5198769056089fb06c4d738ab0e5abc66f7
http://rhn.redhat.com/errata/RHSA-2016-0741.html vendor advisory
http://seclists.org/fulldisclosure/2015/Aug/54 mailing list
http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html vendor advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html mailing list
https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-764
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

Frequently Asked Questions

What is the severity of CVE-2015-6564?
CVE-2015-6564 has been scored as a medium severity vulnerability.
How to fix CVE-2015-6564?
To fix CVE-2015-6564, 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-2015-6564 being actively exploited in the wild?
It is possible that CVE-2015-6564 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.
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