GNU C Library up to 2.19.18+deb8u3 on Debian Linux debian/sysdeps/linux.mk pt_chown access control
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
8.2 | $0-$5k | 0.00 |
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. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.
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 vulnerability database at Tenable (91334). Similar entries are available at 10583, 73929, 75092 and 79344.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 8.4VulDB Meta Temp Score: 8.2
VulDB Base Score: 8.4
VulDB Temp Score: 8.0
VulDB Vector: 🔍
VulDB Reliability: 🔍
NVD Base Score: 8.4
NVD Vector: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: Access controlCWE: CWE-264
CAPEC: 🔍
ATT&CK: 🔍
Local: Yes
Remote: No
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
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: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Reaction Time: 🔍
Exposure Time: 🔍
Upgrade: C Library 2.19-18+deb8u4
Patch: anonscm.debian.org
Timeline
02/23/2016 🔍03/06/2016 🔍
03/13/2016 🔍
03/13/2016 🔍
03/14/2016 🔍
03/14/2016 🔍
03/24/2016 🔍
05/25/2016 🔍
05/26/2016 🔍
07/10/2022 🔍
Sources
Vendor: gnu.orgAdvisory: USN-2985-1
Status: Not defined
Confirmation: 🔍
CVE: CVE-2016-2856 (🔍)
Vulnerability Center: 57689 - Gnu glibc before 2.19-18+deb8u4 Local Data Spoofing and Privilege Escalation Vulnerability, Medium
SecurityFocus: 84601 - GNU glibc 'pt_chown' Local Security Bypass Vulnerability
See also: 🔍
Entry
Created: 03/14/2016 09:24Updated: 07/10/2022 11:25
Changes: 03/14/2016 09:24 (75), 02/02/2019 11:36 (13), 07/10/2022 11:25 (4)
Complete: 🔍
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