Jed Wing CHM lib up to 0.36 chmlib _chm_decompress_block memory corruption

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.
6.6	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in Jed Wing CHM lib up to 0.36. The affected element is the function _chm_decompress_block in the library chmlib. The manipulation leads to memory corruption. This vulnerability is documented as CVE-2005-3318. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Jed Wing CHM lib up to 0.36 and classified as critical. This issue affects the function _chm_decompress_block in the library chmlib. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Buffer overflow in the _chm_decompress_block function in CHM lib (chmlib) before 0.37, as used in products such as KchmViewer, allows attackers execute arbitrary code, a different vulnerability than CVE-2005-2930.

The bug was discovered 10/24/2005. The weakness was released 10/26/2005 by Sven Tantau (Website). The advisory is shared at sven-tantau.de. The identification of this vulnerability is CVE-2005-3318 since 10/27/2005. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful 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 2 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 20267 (GLSA-200511-23 : chmlib, KchmViewer: Stack-based buffer overflow), 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.

Upgrading to version 0.37 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 (22885), Tenable (20267), SecurityFocus (BID 15211†), OSVDB (20335†) and Secunia (SA17325†). Entries connected to this vulnerability are available at VDB-26873, VDB-26704, VDB-30948 and VDB-34743. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Jed Wing

Name

• CHM lib

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.6

VulDB Base Score: 7.3
VulDB Temp Score: 6.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Proof-of-Concept

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 20267
Nessus Name: GLSA-200511-23 : chmlib, KchmViewer: Stack-based buffer overflow
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 55814
OpenVAS Name: Debian Security Advisory DSA 886-1 (chmlib)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: CHM lib 0.37

Timelineinfo

10/24/2005 🔍
10/26/2005 +2 days 🔍
10/26/2005 +0 days 🔍
10/26/2005 +0 days 🔍
10/26/2005 +0 days 🔍
10/26/2005 +0 days 🔍
10/27/2005 +0 days 🔍
10/27/2005 +0 days 🔍
11/28/2005 +32 days 🔍
12/07/2005 +9 days 🔍
12/13/2005 +6 days 🔍
03/11/2015 +3375 days 🔍
06/12/2019 +1554 days 🔍

Sourcesinfo

Advisory: sven-tantau.de
Researcher: Sven Tantau
Status: Not defined
Confirmation: 🔍

CVE: CVE-2005-3318 (🔍)
GCVE (CVE): GCVE-0-2005-3318
GCVE (VulDB): GCVE-100-26681
X-Force: 22885
SecurityFocus: 15211 - Jed Wing CHM Lib Stack Buffer Overflow Vulnerability
Secunia: 17325 - CHM Lib Multiple Buffer Overflow Vulnerabilities, Moderately Critical
OSVDB: 20335 - chmlib _chm_decompress_block() Function CHM File Processing Overflow
Vulnerability Center: 9949 - chmlib Buffer Overflow via a Crafted .chm File, Medium
Vupen: ADV-2005-2207

See also: 🔍

Entryinfo

Created: 03/11/2015 23:39
Updated: 06/12/2019 15:26
Changes: 03/11/2015 23:39 (87), 06/12/2019 15:26 (1)
Complete: 🔍
Cache ID: 216::103

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

Discussion

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