#VU79706 Buffer overflow in Bzip3 - CVE-2023-29420

Vulnerability identifier: #VU79706

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-2023-29420

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Bzip3
Universal components / Libraries / Libraries used by multiple products

Vendor: Bzip3 Project

Description

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

The vulnerability exists due to a boundary error within the bz3_decode_block() function in libbzip3.a. A remote attacker can trigger memory corruption 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

Bzip3: 1.0.0 - 1.2.2

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External links
https://github.com/kspalaiologos/bzip3/commit/bb06deb85f1c249838eb938e0dab271d4194f8fa
https://github.com/kspalaiologos/bzip3/compare/1.2.2...1.2.3
https://github.com/kspalaiologos/bzip3/issues/92
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NA7S7HDUAINOTCSWQZ5LIW756DYY22V2/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4JLSE25SV7K2NB6FTFT4UHJOJUHBHYHY/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NMLFV2FJK3CM7NJLVPZI5RUAFQZICPWW/

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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.