GNU C Library up to 2.22 elf/rtld.c process_envvars LD_POINTER_GUARD 7pk security

CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in GNU C Library up to 2.22. This affects the function process_envvars of the file elf/rtld.c. The manipulation of the argument LD_POINTER_GUARD with the input 0 results in 7pk security. This vulnerability is known as CVE-2015-8777. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in GNU C Library up to 2.22 (Software Library). It has been classified as critical. Affected is the function process_envvars of the file elf/rtld.c. The manipulation of the argument LD_POINTER_GUARD with the input value 0 leads to a 7pk security vulnerability. CWE is classifying the issue as CWE-254. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The process_envvars function in elf/rtld.c in the GNU C Library (aka glibc or libc6) before 2.23 allows local users to bypass a pointer-guarding protection mechanism via a zero value of the LD_POINTER_GUARD environment variable.

The weakness was published 01/20/2016 as Bug 18928 as not defined bug report (Bugzilla). The advisory is available at sourceware.org. This vulnerability is traded as CVE-2015-8777 since 01/18/2016. Local access is required to approach this attack. The requirement for exploitation is a authentication. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1211 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 88767 (Debian DSA-3480-1 : eglibc - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian 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 2.23 eliminates this vulnerability. A possible mitigation has been published 4 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (88767), SecurityFocus (BID 81469†) and Vulnerability Center (SBV-56285†). Similar entries are available at VDB-10583, VDB-73929, VDB-75092 and VDB-79344. If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.7
VulDB Meta Temp Score: 7.5

VulDB Base Score: 9.8
VulDB Temp Score: 9.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: 7pk security
CWE: CWE-254
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 88767
Nessus Name: Debian DSA-3480-1 : eglibc - security update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 703480
OpenVAS Name: Debian Security Advisory DSA 3480-1 (eglibc - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Upgrade: C Library 2.23

Timelineinfo

01/18/2016 🔍
01/18/2016 +0 days 🔍
01/19/2016 +1 days 🔍
01/20/2016 +0 days 🔍
01/20/2016 +0 days 🔍
01/22/2016 +2 days 🔍
01/30/2016 +8 days 🔍
02/15/2016 +16 days 🔍
02/16/2016 +1 days 🔍
07/05/2022 +2330 days 🔍

Sourcesinfo

Vendor: gnu.org

Advisory: Bug 18928
Status: Not defined
Confirmation: 🔍

CVE: CVE-2015-8777 (🔍)
GCVE (CVE): GCVE-0-2015-8777
GCVE (VulDB): GCVE-100-80610
SecurityFocus: 81469 - GNU glibc CVE-2015-8777 Local Security Bypass Vulnerability
SecurityTracker: 1034811
Vulnerability Center: 56285 - GlibC <=2.23 Local Security Bypass in Pointer Guarding via LD_POINTER_GUARD, Low

See also: 🔍

Entryinfo

Created: 01/22/2016 09:31
Updated: 07/05/2022 17:45
Changes: 01/22/2016 09:31 (79), 07/23/2018 07:29 (13), 07/05/2022 17:45 (3)
Complete: 🔍
Cache ID: 216:20C:103

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