Alwil Software Avast! Antivirus up to 4.6.763 Temp Directory information disclosure

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.
4.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Alwil Software Avast! Antivirus up to 4.6.763. It has been declared as problematic. This affects an unknown part of the component Temp Directory Handler. Executing a manipulation can lead to information disclosure. This vulnerability is tracked as CVE-2006-1355. No exploit exists. It is recommended to use an alternative to replace the affected component.

Detailsinfo

A vulnerability has been found in Alwil Software Avast! Antivirus up to 4.6.763 (Anti-Malware Software) and classified as problematic. This vulnerability affects some unknown processing of the component Temp Directory Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

avast! Antivirus 4.6.763 and earlier sets "BUILTIN\Everyone" permissions to critical system files in the installation folder, which allows local users to gain privileges or disable protection by modifying those files.

The weakness was disclosed 03/20/2006 by toadlife and hpguru (Website). The advisory is shared for download at forum.avast.com. This vulnerability was named CVE-2006-1355 since 03/21/2006. Access to the local network is required for this attack to succeed. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1592.

After even before and not, there has been an exploit disclosed. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $5k-$25k.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at avast.com. The problem might be mitigated by replacing the product with as an alternative. The best possible mitigation is suggested to be establishing an alternative product.

The vulnerability is also documented in the databases at X-Force (25336), SecurityFocus (BID 17158†), OSVDB (24007†) and Secunia (SA19284†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Alternative
Status: 🔍

0-Day Time: 🔍

Patch: avast.com

Timelineinfo

03/04/2006 🔍
03/12/2006 +8 days 🔍
03/20/2006 +8 days 🔍
03/20/2006 +0 days 🔍
03/20/2006 +0 days 🔍
03/21/2006 +0 days 🔍
03/21/2006 +0 days 🔍
03/21/2006 +0 days 🔍
04/21/2018 +4414 days 🔍

Sourcesinfo

Advisory: forum.avast.com
Researcher: toadlife, hpguru
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2006-1355 (🔍)
GCVE (CVE): GCVE-0-2006-1355
GCVE (VulDB): GCVE-100-2092
X-Force: 25336 - avast! Antivirus installation files insecure permissions, Medium Risk
SecurityFocus: 17158 - Avast! Antivirus Local Insecure Permissions Vulnerability
Secunia: 19284 - avast! Antivirus Insecure Default File Permissions, Less Critical
OSVDB: 24007 - avast! Antivirus Installation File Permission Weakness Privilege Escalation
Vupen: ADV-2006-1011

Entryinfo

Created: 03/21/2006 11:17
Updated: 04/21/2018 09:15
Changes: 03/21/2006 11:17 (68), 04/21/2018 09:15 (8)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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