VDB-191767 · CVE-2021-46522 · ID 196

Cesanta MJS 2.20.0 libasan.so.4 heap-based overflow

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.
5.5	$0-$5k	0.00

A vulnerability has been found in Cesanta MJS 2.20.0 and classified as critical. Affected by this vulnerability is some unknown functionality in the library /usr/lib/x86_64-linux-gnu/libasan.so.4. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-122. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via /usr/lib/x86_64-linux-gnu/libasan.so.4+0xaff53.

The weakness was disclosed 01/28/2022 as 196. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2021-46522 since 01/24/2022. The exploitation appears to be easy. The attack can only be initiated within the local network. A single authentication is required for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/29/2022).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Productinfoedit

Vendor

Cesanta

Name

CPE 2.3infoedit

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CPE 2.2infoedit

🔒

CVSSv3infoedit

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2infoedit

AV	AC	Au	C	I	A
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🔍	🔍	🔍	🔍	🔍	🔍
🔍	🔍	🔍	🔍	🔍	🔍

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

Exploitinginfoedit

Class: Memory corruption
CWE: CWE-122
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfoedit

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

Countermeasuresinfoedit

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfoedit

01/24/2022 CVE reserved
01/28/2022 +4 days Advisory disclosed
01/28/2022 +0 days VulDB entry created
01/29/2022 +1 days VulDB last update

Sourcesinfoedit

Advisory: 196
Status: Confirmed

CVE: CVE-2021-46522 (🔒)

Entryinfoedit

Created: 01/28/2022 08:48 AM
Updated: 01/29/2022 05:43 PM
Changes: (1) source_cve_nvd_summary
Complete: 🔍