#VU63638 Use-after-free in lrzip - CVE-2022-26291

Vulnerability identifier: #VU63638

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-26291

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
lrzip
Other software / Other software solutions

Vendor: ckolivas (Con Kolivas)

Description

The vulnerability allows a remote attacker to perform a Denial of Service attack.

The vulnerability exists due to multiple concurrency use-after-free between zpaq_decompress_buf() and clear_rulist() functions when processing a crafted Irz file. A remote attacker can trick the victim to open a specially crafted Irz file and cause a Denial of Service (DoS).

Mitigation
Install update from vendor's website.

Vulnerable software versions

lrzip: 0.5 - 0.641

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External links
https://github.com/ckolivas/lrzip/issues/206
https://lists.debian.org/debian-lts-announce/2022/04/msg00012.html
https://www.debian.org/security/2022/dsa-5145

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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.