PT-2021-18244 · Xz · Xz

0Xdecaf · Published 2021-04-14 · Updated 2021-05-25 · CVE-2021-29482

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions: xz versions prior to 0.5.8

Description: The issue arises from the function readUvarint used to read the xz container format, which may not terminate a loop when provided with malicious input, potentially leading to a denial of service. This could be exploited if an attacker constructs a series of bytes that cause an infinite loop when Reader.Read is called on them, especially when parsing user-supplied input.

Recommendations: For versions prior to 0.5.8, update to version 0.5.8 to resolve the issue. As a temporary workaround, consider limiting the size of the compressed file input to a reasonable size for your use case to minimize the risk of exploitation.

Fix

Infinite Loop

Weakness Enumeration

CWE-835

Related Identifiers

CVE-2021-29482

GHSA-25XM-HR59-7C27

GO-2020-0016

RHSA-2022:1276

Affected Products

Xz

References · 14

• https://github.com/ulikunitz/xz/commit/69c6093c7b2397b923acf82cb378f55ab2652b9b · Patch
• https://cve.org/CVERecord?id=CVE-2021-29482 · Security Note
• https://osv.dev/vulnerability/CVE-2021-29482 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-29482 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-29482 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-29482 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-29482 · Vendor Advisory
• https://osv.dev/vulnerability/GO-2020-0016 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-25xm-hr59-7c27 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-29482 · Vendor Advisory
• https://github.com/ulikunitz/xz/security/advisories/GHSA-25xm-hr59-7c27 · Note
• https://github.com/ulikunitz/xz/issues/35 · Note
• https://t.me/cvenotify/14207 · Telegram Post
• https://pkg.go.dev/vuln/GO-2020-0016 · Note