Linux Kernel 2.6.20 Compatibility Mode compat_sys_mount null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel 2.6.20. This vulnerability affects the function compat_sys_mount of the component Compatibility Mode. Performing a manipulation results in null pointer dereference. This vulnerability is known as CVE-2006-7203. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel 2.6.20 (Operating System). This affects the function compat_sys_mount of the component Compatibility Mode. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

The compat_sys_mount function in fs/compat.c in Linux kernel 2.6.20 and earlier allows local users to cause a denial of service (NULL pointer dereference and oops) by mounting a smbfs file system in compatibility mode ("mount -t smbfs").

The bug was discovered 12/07/2006. The weakness was published 05/14/2007 (Website). The advisory is shared at vupen.com. This vulnerability is uniquely identified as CVE-2006-7203 since 05/14/2007. The exploitability is told to be difficult. An attack has to be approached locally. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 158 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 67502 (Oracle Linux 5 : kernel (ELSA-2007-0376)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Oracle Linux Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 156102 (Oracle Enterprise Linux Update for Kernel (ELSA-2007-0376)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (35456), Tenable (67502), SecurityFocus (BID 23870†), OSVDB (35932†) and Secunia (SA25682†). Similar entries are available at VDB-36631, VDB-36319, VDB-37467 and VDB-37242. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 4.6

VulDB Base Score: 5.1
VulDB Temp Score: 4.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 67502
Nessus Name: Oracle Linux 5 : kernel (ELSA-2007-0376)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 60438
OpenVAS Name: Debian Security Advisory DSA 1504-1 (kernel-source-2.6.8 (2.6.8-17sarge1))
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
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Timelineinfo

12/07/2006 🔍
02/05/2007 +60 days 🔍
05/07/2007 +91 days 🔍
05/14/2007 +7 days 🔍
05/14/2007 +0 days 🔍
05/14/2007 +0 days 🔍
05/14/2007 +0 days 🔍
06/15/2007 +32 days 🔍
06/25/2007 +10 days 🔍
06/26/2007 +1 days 🔍
07/12/2013 +2208 days 🔍
03/13/2015 +609 days 🔍
07/20/2019 +1590 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: vupen.com⛔
Status: Not defined
Confirmation: 🔍

CVE: CVE-2006-7203 (🔍)
GCVE (CVE): GCVE-0-2006-7203
GCVE (VulDB): GCVE-100-36765

OVAL: 🔍

X-Force: 35456
SecurityFocus: 23870 - Linux Kernel PPPoE Socket Local Denial of Service Vulnerability
Secunia: 25682
OSVDB: 35932 - CVE-2006-7203 - Linux Kernel - Denial of service Issue
Vulnerability Center: 15435 - Linux Kernel Vulnerability Allows Local Users to Cause DoS, Low
Vupen: ADV-2007-2209

See also: 🔍

Entryinfo

Created: 03/13/2015 14:56
Updated: 07/20/2019 20:34
Changes: 03/13/2015 14:56 (83), 07/20/2019 20:34 (5)
Complete: 🔍
Cache ID: 216::103

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