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Vulnerability Details : CVE-2016-2856

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.
Publish Date : 2016-03-14 Last Update Date : 2016-11-28
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- CVSS Scores & Vulnerability Types

CVSS Score
7.2
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Gain privileges
CWE ID 264

- Products Affected By CVE-2016-2856

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 12.04 * * * Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 14.04 * * * Version Details Vulnerabilities
3 OS Canonical Ubuntu Linux 15.10 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 3

- References For CVE-2016-2856

http://www.openwall.com/lists/oss-security/2016/03/07/2
MLIST [oss-security] 20160306 Re: Access to /dev/pts devices via pt_chown and user namespaces
http://www.halfdog.net/Security/2015/PtChownArbitraryPtsAccessViaUserNamespace/
http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=09f7764882a81e13e7b5d87d715412283a6ce403 CONFIRM
http://www.ubuntu.com/usn/USN-2985-2
UBUNTU USN-2985-2
http://www.ubuntu.com/usn/USN-2985-1
UBUNTU USN-2985-1
http://www.securityfocus.com/bid/84601
BID 84601
http://people.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2856.html CONFIRM
http://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=11475c083282c1582c4dd72eecfcb2b7d308c958 CONFIRM
http://www.openwall.com/lists/oss-security/2016/02/23/3
MLIST [oss-security] 20160223 Access to /dev/pts devices via pt_chown and user namespaces

- Vulnerability Conditions

Vulnerability is valid if product versions listed below are used 0
Vulnerability is valid if product versions listed below are used 0

- Metasploit Modules Related To CVE-2016-2856

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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