Linux Kernel up to 2.6.16.5 on Intel EM64T SYSRET input validation

CVSS Meta Temp Score
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CTI Interest Score
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5.9$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 2.6.16.5 on Intel EM64T. Impacted is an unknown function. The manipulation of the argument SYSRET results in input validation. This vulnerability is reported as CVE-2006-0744. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 2.6.16.5 on Intel EM64T (Operating System). Affected is some unknown functionality. The manipulation of the argument SYSRET with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. CVE summarizes:

Linux kernel before 2.6.16.5 does not properly handle uncanonical return addresses on Intel EM64T CPUs, which reports an exception in the SYSRET instead of the next instruction, which causes the kernel exception handler to run on the user stack with the wrong GS.

The bug was discovered 04/12/2006. The weakness was disclosed 04/17/2006 by Ernie Petrides and Asit B. Mallick with Kernel Team (Website). The advisory is shared for download at kernel.org. This vulnerability is traded as CVE-2006-0744 since 02/17/2006. The attack can only be initiated within the local network. The exploitation doesn't require any form of authentication. There are known technical details, 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 5 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 21253 (Fedora Core 4 : kernel-2.6.16-1.2096_FC4 (2006-423)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 117668 (CentOS Security Update for Kernel (CESA-2006:0437)).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at kernel.org. The best possible mitigation is suggested to be upgrading to the latest version. 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 (25869), Tenable (21253), SecurityFocus (BID 17541†), OSVDB (24639†) and Secunia (SA21498†). The entries VDB-2074, VDB-2114, VDB-2130 and VDB-29029 are pretty similar. Once again VulDB remains the best source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 5.9

VulDB Base Score: 6.5
VulDB Temp Score: 5.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 21253
Nessus Name: Fedora Core 4 : kernel-2.6.16-1.2096_FC4 (2006-423)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 57028
OpenVAS Name: Debian Security Advisory DSA 1103-1 (kernel-source-2.6.8)
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: 🔍

Patch: kernel.org

Timelineinfo

02/17/2006 🔍
04/12/2006 +54 days 🔍
04/12/2006 +0 days 🔍
04/17/2006 +5 days 🔍
04/17/2006 +0 days 🔍
04/17/2006 +0 days 🔍
04/18/2006 +0 days 🔍
04/19/2006 +1 days 🔍
04/21/2006 +2 days 🔍
04/25/2006 +4 days 🔍
05/18/2006 +23 days 🔍
08/14/2006 +88 days 🔍
06/17/2019 +4690 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: kernel.org
Researcher: Ernie Petrides, Asit B. Mallick
Organization: Kernel Team
Status: Not defined
Confirmation: 🔍

CVE: CVE-2006-0744 (🔍)
GCVE (CVE): GCVE-0-2006-0744
GCVE (VulDB): GCVE-100-2172

OVAL: 🔍

X-Force: 25869 - Linux kernel uncanonical return address denial of service, Medium Risk
SecurityFocus: 17541 - Linux Kernel Intel EM64T SYSRET Local Denial of Service Vulnerability
Secunia: 21498 - SUSE update for kernel, Moderately Critical
OSVDB: 24639 - Linux Kernel on Intel EM64T SYSRET Local DoS
Vulnerability Center: 11239 - Linux Kernel Before 2.6.16.5 DoS due to Improper Handling of Uncanonical Addresses, Medium
Vupen: ADV-2006-1475

See also: 🔍

Entryinfo

Created: 04/19/2006 16:55
Updated: 06/17/2019 06:47
Changes: 04/19/2006 16:55 (102), 06/17/2019 06:47 (2)
Complete: 🔍
Cache ID: 216:EDF:103

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