CVE-2016-2856 Detail

Current Description

pt_chown in the glibc package before 2.19-18+deb8u4 on Debian jessie; the elibc package before 2.15-0ubuntu10.14 on Ubuntu 12.04 LTS and before 2.19-0ubuntu6.8 on Ubuntu 14.04 LTS; and the glibc package before 2.21-0ubuntu4.2 on Ubuntu 15.10 and before 2.23-0ubuntu1 on Ubuntu 16.04 LTS and 16.10 lacks a namespace check associated with file-descriptor passing, which allows local users to capture keystrokes and spoof data, and possibly gain privileges, via pts read and write operations, related to debian/sysdeps/linux.mk. NOTE: this is not considered a vulnerability in the upstream GNU C Library because the upstream documentation has a clear security recommendation against the --enable-pt_chown option.


View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  8.4 HIGH
Vector:  CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=09f7764882a81e13e7b5d87d715412283a6ce403
http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=11475c083282c1582c4dd72eecfcb2b7d308c958
http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2856.html
http://www.halfdog.net/Security/2015/PtChownArbitraryPtsAccessViaUserNamespace/
http://www.openwall.com/lists/oss-security/2016/02/23/3
http://www.openwall.com/lists/oss-security/2016/03/07/2
http://www.securityfocus.com/bid/84601
http://www.ubuntu.com/usn/USN-2985-1
http://www.ubuntu.com/usn/USN-2985-2

Weakness Enumeration

CWE-ID CWE Name Source
CWE-264 Permissions, Privileges, and Access Controls cwe source acceptance level NIST  

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Change History

6 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2016-2856
NVD Published Date:
03/13/2016
NVD Last Modified:
11/28/2016
Source:
MITRE