Input validation error in OpenSSH - CVE-2015-6563

Vulnerability identifier: #VU33998

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2015-6563

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to impersonate other users on the system.

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.

OpenSSH
Amazon Linux AMI
Fedora
FlashSystem 900 9840-AE2 and 9843-AE2
FlashSystem 840 9840-AE1 & 9843-AE1
openssh (Alpine package)
openssh
IBM SAN Volume Controller
IBM Storwize V3500
IBM Storwize V3700
IBM Storwize V5000
IBM Storwize V7000

Install updates from vendor's website.

OpenSSH - update to 7.0p1
openssh (Alpine package) - update to 6.4_p1-r4
openssh - addressed in versions 6.6.1p1-16.fc21, 6.9p1-5.fc22, 7.0p1-1.fc23
IBM SAN Volume Controller - addressed in versions 7.6.1.5, 7.7.0.4, 7.7.1.2
IBM Storwize V3500 - addressed in versions 7.6.1.5, 7.7.0.4, 7.7.1.2
IBM Storwize V3700 - addressed in versions 7.6.1.5, 7.7.0.4, 7.7.1.2
IBM Storwize V5000 - addressed in versions 7.6.1.5, 7.7.0.4, 7.7.1.2
IBM Storwize V7000 - addressed in versions 7.6.1.5, 7.7.0.4, 7.7.1.2

• http://lists.apple.com/archives/security-announce/2015/Oct/msg00005.html
• http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
• http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
• http://rhn.redhat.com/errata/RHSA-2016-0741.html
• http://seclists.org/fulldisclosure/2015/Aug/54
• http://www.openssh.com/txt/release-7.0
• http://www.openwall.com/lists/oss-security/2015/08/22/1
• http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
• http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
• http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
• http://www.securityfocus.com/bid/76317
• https://github.com/openssh/openssh-portable/commit/d4697fe9a28dab7255c60433e4dd23cf7fce8a8b
• https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
• https://security.gentoo.org/glsa/201512-04
• https://security.netapp.com/advisory/ntap-20180201-0002/
• https://support.apple.com/HT205375
• https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-766

• Security restrictions bypass in OpenSSH
• Input validation error in openssh (Alpine package)
• Amazon Linux AMI update for openssh
• Amazon Linux AMI update for openssh
• Multiple vulnerabilities in IBM FlashSystem models 840 and 900
• Multiple vulnerabilities in SAN Volume Controller and Storwize Family
• Fedora 23 update for openssh
• Fedora 22 update for openssh
• Fedora 21 update for openssh