Vulnerability identifier: #VU87849

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-29482

CWE-ID: CWE-835

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
xz
Universal components / Libraries / Programming Languages & Components

Vendor: ulikunitz

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due the function readUvarint used to read the xz container format may not terminate a loop providing malicious input. A remote attacker can consume all available system resources and cause denial of service conditions.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

xz: 0.1 - 0.5.7

---

External links
http://github.com/ulikunitz/xz/security/advisories/GHSA-25xm-hr59-7c27
http://github.com/ulikunitz/xz/commit/69c6093c7b2397b923acf82cb378f55ab2652b9b

---

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.