Linux Kernel 2.6.38/3.18 rc1 Crypto API access control

CVSS Meta Temp Score
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CTI Interest Score
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3.5$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in Linux Kernel 2.6.38/3.18 rc1. Impacted is an unknown function of the component Crypto API. This manipulation causes access control. The identification of this vulnerability is CVE-2013-7421. There is no exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Linux Kernel 2.6.38/3.18 rc1 (Operating System). It has been declared as problematic. Affected by this vulnerability is some unknown processing of the component Crypto API. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect integrity. The summary by CVE is:

The Crypto API in the Linux kernel before 3.18.5 allows local users to load arbitrary kernel modules via a bind system call for an AF_ALG socket with a module name in the salg_name field, a different vulnerability than CVE-2014-9644.

The issue has been introduced in 03/14/2011. The weakness was shared 01/23/2015 by Mathias Krause as confirmed mailinglist post (oss-sec). It is possible to read the advisory at seclists.org. This vulnerability is known as CVE-2013-7421 since 01/24/2015. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

The vulnerability was handled as a non-public zero-day exploit for at least 1411 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 82072 (Ubuntu 14.04 LTS : linux-lts-utopic vulnerabilities (USN-2545-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157067 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2015-3012)).

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

The vulnerability is also documented in the databases at X-Force (100591), Tenable (82072), SecurityFocus (BID 72322†) and Vulnerability Center (SBV-48855†). Additional details are provided at bugzilla.redhat.com. The entries VDB-67366 and VDB-69020 are related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.0
VulDB Meta Temp Score: 3.5

VulDB Base Score: 4.0
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

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Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Unproven

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 82072
Nessus Name: Ubuntu 14.04 LTS : linux-lts-utopic vulnerabilities (USN-2545-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

OpenVAS ID: 703170
OpenVAS Name: Debian Security Advisory DSA 3170-1 (linux - security update)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 5d26a105b5a73e5635eae0629b42fa0a90e07b7b

Timelineinfo

03/14/2011 🔍
01/23/2015 +1411 days 🔍
01/23/2015 +0 days 🔍
01/24/2015 +1 days 🔍
01/27/2015 +3 days 🔍
02/05/2015 +9 days 🔍
03/02/2015 +25 days 🔍
03/03/2015 +1 days 🔍
03/25/2015 +22 days 🔍
03/08/2022 +2540 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: USN-2545-1
Researcher: Mathias Krause
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2013-7421 (🔍)
GCVE (CVE): GCVE-0-2013-7421
GCVE (VulDB): GCVE-100-69019

OVAL: 🔍

X-Force: 100591 - Linux Kernel in the Crypto API security bypass, Low Risk
SecurityFocus: 72322 - Linux Kernel Crypto API CVE-2013-7421 Local Security Bypass Vulnerability
Vulnerability Center: 48855 - Linux Kernel before 3.18.5 Local Bypass Restrictions via a Bind System Call - CVE-2013-7421, Low

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 02/05/2015 10:49
Updated: 03/08/2022 11:36
Changes: 02/05/2015 10:49 (74), 06/21/2017 11:05 (9), 03/08/2022 11:20 (4), 03/08/2022 11:28 (1), 03/08/2022 11:36 (2)
Complete: 🔍
Cache ID: 216:C6B:103

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