Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd...

Vulnerability 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.

References

• http://www.openwall.com/lists/oss-security/2015/08/22/1
• http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
• http://www.securityfocus.com/bid/76317
• http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
• https://security.gentoo.org/glsa/201512-04
• https://kc.mcafee.com/corporate/index?page=content&id=SB10136
• http://www.openssh.com/txt/release-7.0
• 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
• http://seclists.org/fulldisclosure/2015/Aug/54
• http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
• http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
• https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
• 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