Avast/AVG Free Antivirus up to 20.3 Hard Link privileges management

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Avast/AVG Free Antivirus up to 20.3. The impacted element is an unknown function of the component Hard Link Handler. The manipulation results in privileges management. This vulnerability was named CVE-2020-13657. The attack needs to be approached locally. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in Avast/AVG Free Antivirus up to 20.3 (Anti-Malware Software). Affected is an unknown code block of the component Hard Link Handler. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

An elevation of privilege vulnerability exists in Avast Free Antivirus and AVG AntiVirus Free before 20.4 due to improperly handling hard links. The vulnerability allows local users to take control of arbitrary files.

The weakness was presented 06/29/2020 (Website). The advisory is shared for download at forum.avast.com. This vulnerability is traded as CVE-2020-13657 since 05/28/2020. The attack needs to be approached locally. The requirement for exploitation is a authentication. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 20.4 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Privileges management
CWE: CWE-269 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Free Antivirus 20.4

Timelineinfo

05/28/2020 🔍
06/29/2020 +32 days 🔍
06/30/2020 +1 days 🔍
10/27/2020 +119 days 🔍

Sourcesinfo

Advisory: forum.avast.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2020-13657 (🔍)
GCVE (CVE): GCVE-0-2020-13657
GCVE (VulDB): GCVE-100-157428

Entryinfo

Created: 06/30/2020 08:38
Updated: 10/27/2020 20:58
Changes: 06/30/2020 08:38 (39), 06/30/2020 08:43 (18), 10/27/2020 20:58 (1)
Complete: 🔍
Cache ID: 216::103

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