#VU60953 Stack-based buffer overflow in pjsip - CVE-2021-43300

Vulnerability identifier: #VU60953

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2021-43300

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
pjsip
Universal components / Libraries / Libraries used by multiple products

Vendor: pjsip

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in PJSUA API when calling pjsua_recorder_create. A remote unauthenticated attacker can trigger stack-based buffer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

pjsip: 0.5.0.1 - 2.11.1

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External links
https://github.com/pjsip/pjproject/security/advisories/GHSA-qcvw-h34v-c7r9
https://jfrog.com/blog/jfrog-discloses-5-memory-corruption-vulnerabilities-in-pjsip-a-popular-multimedia-library/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.