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CVE-2016-2856

8.4 · HIGH

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 pa…

Published Mar 14, 2016CWE-264EPSS 1.03%

Overview

CVE-2016-2856 is a high-severity vulnerability. It was published on March 14, 2016 and has a CVSS 3.0 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.0 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refanonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=09f7764882a81e13e7b5d87d715412283a6ce403Refanonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=11475c083282c1582c4dd72eecfcb2b7d308c958Refpeople.canonical.com/~ubuntu-security/cve/2016/CVE-2016-2856.htmlRefwww.halfdog.net/Security/2015/PtChownArbitraryPtsAccessViaUserNamespace/Refwww.openwall.com/lists/oss-security/2016/02/23/3Refwww.openwall.com/lists/oss-security/2016/03/07/2Refwww.securityfocus.com/bid/84601Refwww.ubuntu.com/usn/USN-2985-1Refwww.ubuntu.com/usn/USN-2985-2Refanonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?h=jessie&id=09f7764882a81e13e7b5d87d715412283a6ce403

How CyberStrike helps

Frequently asked questions

What is CVE-2016-2856?

CVE-2016-2856 is a high-severity vulnerability. It was published on March 14, 2016 and has a CVSS 3.0 base score of 8.4 (HIGH).

How severe is CVE-2016-2856?

This vulnerability has a CVSS 3.0 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2016-2856?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2016-2856?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-2856 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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