GNU C Library up to 2.19.18+deb8u3 on Debian Linux debian/sysdeps/linux.mk pt_chown access control

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8.2$0-$5k0.87

Summaryinfo

A vulnerability was found in GNU C Library up to 2.19.18+deb8u3 on Debian Linux. It has been declared as problematic. This issue affects the function pt_chown of the file debian/sysdeps/linux.mk. The manipulation results in access control. This vulnerability is known as CVE-2016-2856. Attacking locally is a requirement. Furthermore, an exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in GNU C Library up to 2.19.18+deb8u3 on Debian Linux (Software Library). Affected is the function pt_chown of the file debian/sysdeps/linux.mk. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-264. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

pt_chown in the glibc package before 2.19-18+deb8u4 on Debian jessie 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.

The weakness was published 03/14/2016 (oss-sec). The advisory is shared for download at openwall.com. This vulnerability is traded as CVE-2016-2856 since 03/06/2016. The attack needs to be approached locally. Required for exploitation is a authentication. Technical details and a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1068.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 91334 (Ubuntu 12.04 LTS / 14.04 LTS / 15.10 : eglibc, glibc vulnerabilities (USN-2985-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196484 (Ubuntu Security Notification for Eglibc, Glibc Vulnerabilities (USN-2985-1)).

Upgrading to version 2.19-18+deb8u4 eliminates this vulnerability. A possible mitigation has been published 3 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (41760), Tenable (91334), SecurityFocus (BID 84601†) and Vulnerability Center (SBV-57689†). Similar entries are available at VDB-10583, VDB-73929, VDB-75092 and VDB-79344. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.4
VulDB Meta Temp Score: 8.0

VulDB Base Score: 8.4
VulDB Temp Score: 7.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.4
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 91334
Nessus Name: Ubuntu 12.04 LTS / 14.04 LTS / 15.10 : eglibc, glibc vulnerabilities (USN-2985-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 841810
OpenVAS Name: Ubuntu Update for glibc USN-2985-2
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
Exposure Time: 🔍

Upgrade: C Library 2.19-18+deb8u4
Patch: anonscm.debian.org

Timelineinfo

02/23/2016 🔍
03/06/2016 +12 days 🔍
03/13/2016 +7 days 🔍
03/13/2016 +0 days 🔍
03/14/2016 +1 days 🔍
03/14/2016 +0 days 🔍
03/24/2016 +10 days 🔍
05/25/2016 +62 days 🔍
05/26/2016 +1 days 🔍
11/30/2024 +3110 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: USN-2985-1
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-2856 (🔍)
GCVE (CVE): GCVE-0-2016-2856
GCVE (VulDB): GCVE-100-81360
SecurityFocus: 84601 - GNU glibc 'pt_chown' Local Security Bypass Vulnerability
Vulnerability Center: 57689 - Gnu glibc before 2.19-18+deb8u4 Local Data Spoofing and Privilege Escalation Vulnerability, Medium

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 03/14/2016 09:24
Updated: 11/30/2024 17:01
Changes: 03/14/2016 09:24 (75), 02/02/2019 11:36 (13), 07/10/2022 11:25 (4), 11/30/2024 17:01 (24)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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