XFree86 up to 4.6.0 AFM scan_cidfont heap-based overflow

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5.7$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in XFree86 up to 4.6.0. Impacted is the function scan_cidfont of the component AFM Handler. Performing a manipulation results in heap-based overflow. This vulnerability is known as CVE-2006-3739. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in XFree86 up to 4.6.0. It has been classified as problematic. This affects the function scan_cidfont of the component AFM Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Integer overflow in the CIDAFM function in X.Org 6.8.2 and XFree86 X server allows local users to execute arbitrary code via crafted Adobe Font Metrics (AFM) files with a modified number of character metrics (StartCharMetrics), which leads to a heap-based buffer overflow.

The bug was discovered 09/12/2006. The weakness was published 09/13/2006 by iDefense with iDEFENSE (Website). It is possible to read the advisory at lists.freedesktop.org. This vulnerability is uniquely identified as CVE-2006-3739 since 07/20/2006. The attack can only be done within the local network. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 22352 (GLSA-200609-07 : LibXfont, monolithic X.org: Multiple integer overflows), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 156240 (Oracle Enterprise Linux Update for X.org (ELSA-2006:0665)).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at xorg.freedesktop.org. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (28899), Tenable (22352), SecurityFocus (BID 19974†), OSVDB (28738†) and Secunia (SA21890†). Similar entries are available at VDB-2534 and VDB-32233. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 5.7

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
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NVD Base Score: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
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: 22352
Nessus Name: GLSA-200609-07 : LibXfont, monolithic X.org: Multiple integer overflows
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 58696
OpenVAS Name: Debian Security Advisory DSA 1193-1 (xfree86)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Patch: xorg.freedesktop.org

Timelineinfo

07/20/2006 🔍
09/12/2006 +54 days 🔍
09/12/2006 +0 days 🔍
09/12/2006 +0 days 🔍
09/12/2006 +0 days 🔍
09/12/2006 +0 days 🔍
09/13/2006 +1 days 🔍
09/13/2006 +0 days 🔍
09/13/2006 +0 days 🔍
09/13/2006 +0 days 🔍
09/15/2006 +1 days 🔍
09/15/2006 +0 days 🔍
09/18/2006 +3 days 🔍
06/25/2019 +4663 days 🔍

Sourcesinfo

Advisory: lists.freedesktop.org
Researcher: iDefense
Organization: iDEFENSE
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2006-3739 (🔍)
GCVE (CVE): GCVE-0-2006-3739
GCVE (VulDB): GCVE-100-2535

OVAL: 🔍

X-Force: 28899
SecurityFocus: 19974 - X.Org LibXfont CID Font File Multiple Integer Overflow Vulnerabilities
Secunia: 21890 - XFree86 CID Encoded Fonts Integer Overflows, Less Critical
OSVDB: 28738 - X.Org X11 libXfont CID-keyed Fonts scan_cidfont() Function Overflow
SecurityTracker: 1016828
Vulnerability Center: 12702 - X.Org and XFree86 Servers Local Code Execution via Crafted AFM Files, Medium
Vupen: ADV-2006-3581

See also: 🔍

Entryinfo

Created: 09/15/2006 12:20
Updated: 06/25/2019 12:29
Changes: 09/15/2006 12:20 (99), 06/25/2019 12:29 (1)
Complete: 🔍
Cache ID: 216:BB9:103

Be aware that VulDB is the high quality source for vulnerability data.

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