PT-2020-6434 · Lrzip+2 · Lrzip+2

5Hadowblad3 · Published 2020-09-04 · Updated 2023-02-02 · CVE-2021-27347

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Lrzip version 0.631

Description The issue is related to a use after free in the lzma decompress buf function in stream.c, which can be exploited by attackers to cause a Denial of Service (DoS) via a crafted compressed file. This can allow a remote attacker to disrupt service using a specially crafted compressed file.

Recommendations For Lrzip version 0.631, consider avoiding the use of the lzma decompress buf function until a patch is available. As a temporary workaround, restrict the processing of compressed files from untrusted sources to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

BDU:2021-04677

CVE-2021-27347

DLA-2981-1

DSA-5145-1

USN-5840-1

Affected Products

Linuxmint

Lrzip

Ubuntu

References · 20

• 🔥 https://github.com/ckolivas/lrzip/issues/165 · Exploit
• https://osv.dev/vulnerability/USN-5840-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-27347 · Security Note
• https://ubuntu.com/security/CVE-2021-27345 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-04677 · Security Note
• https://ubuntu.com/security/CVE-2018-5786 · Vendor Advisory
• https://osv.dev/vulnerability/DLA-2981-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-27347 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-25467 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-27347 · Security Note
• https://ubuntu.com/security/CVE-2022-26291 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-27347 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-27347 · Vendor Advisory
• https://osv.dev/vulnerability/DSA-5145-1 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-5840-1 · Vendor Advisory