Linux Kernel 3.8.0/3.8.1/3.8.2/3.8.3 Child Process signal.c sa_restorer access control

CVSS Meta Temp Score
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CTI Interest Score
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3.2$0-$5k0.00

Summaryinfo

A vulnerability has been found in Linux Kernel 3.8.0/3.8.1/3.8.2/3.8.3 and classified as problematic. Affected by this vulnerability is the function sa_restorer of the file signal.c of the component Child Process Handler. The manipulation leads to access control. This vulnerability is uniquely identified as CVE-2013-0914. No exploit exists. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in Linux Kernel 3.8.0/3.8.1/3.8.2/3.8.3 (Operating System) and classified as problematic. This issue affects the function sa_restorer of the file signal.c of the component Child Process Handler. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality. The summary by CVE is:

The flush_signal_handlers function in kernel/signal.c in the Linux kernel before 3.8.4 preserves the value of the sa_restorer field across an exec operation, which makes it easier for local users to bypass the ASLR protection mechanism via a crafted application containing a sigaction system call.

The weakness was disclosed 03/11/2013 by Kees Cook as CVE-2013-0914 Linux kernel sa_restorer information leak as not defined mailinglist post (oss-sec). The advisory is shared at seclists.org. The identification of this vulnerability is CVE-2013-0914 since 01/07/2013. The exploitation is known to be easy. An attack has to be approached locally. A simple authentication is necessary for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 74878 (openSUSE Security Update : kernel (openSUSE-SU-2013:1971-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 350526 (Amazon Linux Security Advisory for kernel: ALAS-2013-218).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (74878), SecurityFocus (BID 58177†), OSVDB (91271†), Secunia (SA52845†) and Vulnerability Center (SBV-40786†). lkml.org is providing further details. The entries VDB-7839, VDB-8073, VDB-8484 and VDB-8499 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.2

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

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Current Price Estimation: 🔍

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Nessus ID: 74878
Nessus Name: openSUSE Security Update : kernel (openSUSE-SU-2013:1971-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 892668
OpenVAS Name: Debian Security Advisory DSA 2668-1 (linux-2.6 - privilege escalation/denial of service/information leak
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Patch
Status: 🔍

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Patch: git.kernel.org
McAfee IPS: 🔍
McAfee IPS Version: 🔍

Timelineinfo

01/07/2013 🔍
02/26/2013 +50 days 🔍
03/11/2013 +13 days 🔍
03/11/2013 +0 days 🔍
03/11/2013 +0 days 🔍
03/15/2013 +4 days 🔍
03/22/2013 +7 days 🔍
04/03/2013 +12 days 🔍
08/01/2013 +120 days 🔍
06/13/2014 +316 days 🔍
05/06/2021 +2519 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: CVE-2013-0914 Linux kernel sa_restorer information leak
Researcher: Kees Cook
Status: Not defined
Confirmation: 🔍

CVE: CVE-2013-0914 (🔍)
GCVE (CVE): GCVE-0-2013-0914
GCVE (VulDB): GCVE-100-7997

OVAL: 🔍

SecurityFocus: 58177 - Linux Kernel CVE-2013-1767 Local Privilege Escalation Vulnerability
Secunia: 52845 - Ubuntu update for kernel, Less Critical
OSVDB: 91271
Vulnerability Center: 40786 - Linux Kernel Before 3.8.4 Local Leakage of Information (CVE-2013-0914), Low

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 03/15/2013 11:54
Updated: 05/06/2021 12:23
Changes: 03/15/2013 11:54 (85), 05/07/2017 11:30 (4), 05/06/2021 12:23 (3)
Complete: 🔍
Cache ID: 216:F11:103

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