Linux Kernel up to 2.6.16.11 SMBFS/CIFS path traversal

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.9$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 2.6.16.11. This issue affects some unknown processing of the component SMBFS/CIFS. Performing a manipulation with the input ../ results in path traversal. This vulnerability was named CVE-2006-1863. In addition, an exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 2.6.16.11 (Operating System). It has been classified as critical. This affects some unknown functionality of the component SMBFS/CIFS. The manipulation with the input value ../ leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on confidentiality, and integrity. The summary by CVE is:

Directory traversal vulnerability in CIFS in Linux 2.6.16 and earlier allows local users to escape chroot restrictions for an SMB-mounted filesystem via "..\\" sequences, a similar vulnerability to CVE-2006-1864.

The bug was discovered 04/24/2006. The weakness was presented 04/28/2006 by Marcel Holtmann (Website). The advisory is shared at kernel.org. This vulnerability is uniquely identified as CVE-2006-1863 since 04/19/2006. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details and a public exploit are known. MITRE ATT&CK project uses the attack technique T1006 for this issue.

After even before and not, there has been an exploit disclosed. The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 6 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 24101 (Fedora Core 4 : kernel-2.6.16-1.2108_FC4 (2006-517)), 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.

Upgrading to version 2.6.16.11 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 1 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (26141), Exploit-DB (27769), Tenable (24101), SecurityFocus (BID 17742†) and OSVDB (25068†). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

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

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 24101
Nessus Name: Fedora Core 4 : kernel-2.6.16-1.2108_FC4 (2006-517)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

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

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Kernel 2.6.16.11
Patch: kernel.org

Timelineinfo

04/19/2006 🔍
04/19/2006 +0 days 🔍
04/24/2006 +5 days 🔍
04/24/2006 +0 days 🔍
04/25/2006 +1 days 🔍
04/28/2006 +3 days 🔍
04/28/2006 +0 days 🔍
04/28/2006 +0 days 🔍
05/05/2006 +6 days 🔍
05/05/2006 +0 days 🔍
12/19/2006 +228 days 🔍
01/17/2007 +29 days 🔍
02/02/2025 +6591 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: kernel.org
Researcher: Marcel Holtmann
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2006-1863 (🔍)
GCVE (CVE): GCVE-0-2006-1863
GCVE (VulDB): GCVE-100-2193

OVAL: 🔍

X-Force: 26141 - Linux kernel CIFS directory traversal, Low Risk
SecurityFocus: 17742 - Linux Kernel CIFS CHRoot Security Restriction Bypass Vulnerability
Secunia: 19868 - Linux Kernel CIFS chroot Directory Traversal Vulnerability, Less Critical
OSVDB: 25068 - Linux Kernel CIFS SMB Mount Traversal chroot Restriction Bypass
Vulnerability Center: 13392 - Linux Kernel Directory Traversal Vulnerability in CIFS allows chroot Restrictions Bypass, Medium
Vupen: ADV-2006-1542

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/05/2006 17:16
Updated: 02/02/2025 10:22
Changes: 05/05/2006 17:16 (99), 07/12/2019 09:42 (2), 02/02/2025 10:22 (21)
Complete: 🔍
Cache ID: 216:5AA:103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Do you need the next level of professionalism?

Upgrade your account now!