// For flags

CVE-2015-6563

openssh: Privilege separation weakness related to PAM support

Severity Score

1.9
*CVSS v2

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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.

Vulnerabilidad en el componente monitor en sshd en OpenSSH en versiones anteriores a 7.0 en plataformas no OpenBSD, acepta datos de nombre de usuario extraños en las solicitudes MONITOR_REQ_PAM_INIT_CTX, lo que permite a usuarios locales llevar a cabo ataques de suplantación aprovechando cualquier acceso de inicio de sesión SSH junto con el control del sshd uid para enviar una petición MONITOR_REQ_PWNAM manipulada, relacionado con monitor.c y monitor_wrap.c.

A flaw was found in the way OpenSSH handled PAM authentication when using privilege separation. An attacker with valid credentials on the system and able to fully compromise a non-privileged pre-authentication process using a different flaw could use this flaw to authenticate as other users.

*Credits: N/A
CVSS Scores
Attack Vector
Local
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
Attack Vector
Local
Attack Complexity
High
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2015-08-21 CVE Reserved
  • 2015-08-24 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-08-06 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
  • CWE-266: Incorrect Privilege Assignment
CAPEC
References (20)
URL Tag Source
http://seclists.org/fulldisclosure/2015/Aug/54 Mailing List
http://www.openwall.com/lists/oss-security/2015/08/22/1 Mailing List
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 Vdb Entry
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 Mailing List
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
URL Date SRC
URL Date SRC
URL Date SRC
http://lists.apple.com/archives/security-announce/2015/Oct/msg00005.html 2022-12-13
http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html 2022-12-13
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html 2022-12-13
http://rhn.redhat.com/errata/RHSA-2016-0741.html 2022-12-13
http://www.openssh.com/txt/release-7.0 2022-12-13
https://security.gentoo.org/glsa/201512-04 2022-12-13
https://access.redhat.com/security/cve/CVE-2015-6563 2016-05-10
https://bugzilla.redhat.com/show_bug.cgi?id=1252844 2016-05-10
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Openbsd
Search vendor "Openbsd"
 Openssh
Search vendor "Openbsd" for product "Openssh"
 <= 6.9
Search vendor "Openbsd" for product "Openssh" and version " <= 6.9"
-
Affected
Apple
Search vendor "Apple"
 Mac Os X
Search vendor "Apple" for product "Mac Os X"
 <= 10.11.0
Search vendor "Apple" for product "Mac Os X" and version " <= 10.11.0"
-
Affected