CVE-2015-6563: Input Validation
First published: Mon Aug 24 2015(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| OpenSSH | <=6.9 | |
| Apple iOS and macOS | <=10.11.0 |
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Reference Links
- 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://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- 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
Frequently Asked Questions
What is the severity of CVE-2015-6563?
CVE-2015-6563 is classified as a high severity vulnerability due to its potential to allow local users to conduct impersonation attacks.
How do I fix CVE-2015-6563?
To fix CVE-2015-6563, update your OpenSSH installation to version 7.0 or later to mitigate the vulnerability.
What systems are affected by CVE-2015-6563?
CVE-2015-6563 affects OpenSSH versions prior to 7.0 on non-OpenBSD platforms, including macOS Yosemite up to version 10.11.0.
What type of attack can CVE-2015-6563 facilitate?
CVE-2015-6563 can facilitate impersonation attacks by allowing local users to leverage SSH login access.
Is CVE-2015-6563 a remote or local vulnerability?
CVE-2015-6563 is a local vulnerability as it requires local user access to exploit the flaw.
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