CVE-2015-6563

MEDIUM

OpenSSH < 6.9 - Local User Impersonation via MONITOR_REQ_PAM_INIT_CTX

Title source: llm

Description

The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.

References (18)

Core 18

Core References

Vendor Advisory

https://support.apple.com/HT205375

Patch

https://github.com/openssh/openssh-portable/commit/d4697fe9a28dab7255c60433e4dd23cf7fce8a8b

View Patch ZIP pw:eip

Mailing List mailing-list

http://www.openwall.com/lists/oss-security/2015/08/22/1

Mailing List, Third Party Advisory vendor-advisory

http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html

Mailing List vendor-advisory

http://lists.apple.com/archives/security-announce/2015/Oct/msg00005.html

Third Party Advisory, VDB Entry vdb-entry

http://www.securityfocus.com/bid/76317

Vendor Advisory

http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html

Third Party Advisory vendor-advisory

https://security.gentoo.org/glsa/201512-04

Vendor Advisory

http://www.openssh.com/txt/release-7.0

Vendor Advisory

http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html

Vendor Advisory vendor-advisory

http://rhn.redhat.com/errata/RHSA-2016-0741.html

Mailing List mailing-list

http://seclists.org/fulldisclosure/2015/Aug/54

Vendor Advisory

http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html

Mailing List vendor-advisory

http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html

Mailing List mailing-list

https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html

Vendor Advisory

https://security.netapp.com/advisory/ntap-20180201-0002/

Various Sources

https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-766

Vendor Advisory

https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

Scores

CVSS v3 6.4

EPSS 0.0038

EPSS Percentile 29.7%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact total

Details

CWE

CWE-20

Status published

Products (2)

apple/mac_os_x < 10.11.0

openbsd/openssh < 6.9

Published Aug 24, 2015

Tracked Since Feb 18, 2026