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

Vulnerability identifier: #VU60953

CSH Severity: High

CVSS v4: 9.3 [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]

CVE-ID: CVE-2021-43300

CWE-ID: CWE-121

Exploitation vector: Remote access

Exploit availability: No public exploit available

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.

pjsip
Debian Linux
Ubuntu
ring (Ubuntu package)
ring-daemon (Ubuntu package)
pjproject (Ubuntu package)
asterisk (Debian package)
jami (Ubuntu package)
jami-daemon (Ubuntu package)

Install updates from vendor's website.

pjsip - update to 2.12
ring (Ubuntu package) - addressed in versions Ubuntu Pro, 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1
ring-daemon (Ubuntu package) - addressed in versions Ubuntu Pro, 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1
pjproject (Ubuntu package) - addressed in versions 2.1.0.0.ast20130823-1+deb8u1ubuntu0.1~esm1, 2.7.2~dfsg-1ubuntu0.1~esm1
asterisk (Debian package) - update to 1:16.28.0~dfsg-0+deb11u1
jami (Ubuntu package) - addressed in versions 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1, 20230206.0~ds1-5ubuntu0.1, 20230206.0~ds2-1.3ubuntu0.1
jami-daemon (Ubuntu package) - addressed in versions 20190215.1.f152c98~ds1-1+deb10u2build0.20.04.1, 20230206.0~ds1-5ubuntu0.1, 20230206.0~ds2-1.3ubuntu0.1

• 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/

• Multiple vulnerabilities in PJSIP
• Debian update for asterisk
• Ubuntu update for ring
• Ubuntu update for ring
• Ubuntu update for pjproject