Google Chrome up to 85.0.4183.83 Offscreen Canvas HTML Page use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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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.
7.4$5k-$25k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Google Chrome. This affects an unknown function of the component Offscreen Canvas Handler. Such manipulation as part of HTML Page leads to use after free. This vulnerability is listed as CVE-2020-6576. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Google Chrome (Web Browser) and classified as critical. Affected by this issue is an unknown functionality of the component Offscreen Canvas Handler. The manipulation as part of a HTML Page leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Use after free in offscreen canvas in Google Chrome prior to 85.0.4183.102 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

The weakness was presented 09/21/2020 (Website). The advisory is shared for download at chromereleases.googleblog.com. This vulnerability is handled as CVE-2020-6576 since 01/08/2020. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 10/15/2024). It is expected to see the exploit prices for this product increasing in the near future.

The vulnerability scanner Nessus provides a plugin with the ID 208576 (CentOS 6 : chromium-browser (RHSA-2020:3740)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 85.0.4183.102 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (208576). See VDB-161151, VDB-161152, VDB-161153 and VDB-161154 for similar entries. Once again VulDB remains the best source for 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: 7.6
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 8.8
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: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 208576
Nessus Name: CentOS 6 : chromium-browser (RHSA-2020:3740)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Chrome 85.0.4183.102

Timelineinfo

01/08/2020 🔍
09/21/2020 +257 days 🔍
09/22/2020 +1 days 🔍
05/05/2025 +1686 days 🔍

Sourcesinfo

Vendor: google.com
Product: google.com

Advisory: chromereleases.googleblog.com
Status: Confirmed

CVE: CVE-2020-6576 (🔍)
GCVE (CVE): GCVE-0-2020-6576
GCVE (VulDB): GCVE-100-161708
See also: 🔍

Entryinfo

Created: 09/22/2020 06:58
Updated: 05/05/2025 03:03
Changes: 09/22/2020 06:58 (42), 09/22/2020 07:03 (18), 10/15/2024 17:40 (19), 05/05/2025 03:03 (5)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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