Vulnerability identifier: #VU50676

Vulnerability risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: N/A

CWE-ID: CWE-276

Exploitation vector: Local

Exploit availability: No

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

Vendor: Facebook Inc.

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to zstd temporarily exposes a world-readable version of its input even if the original file had restrictive permissions. A local user with access to the system can gain access to sensitive information.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Zstandard: 1.4.0 - 1.4.8, 1.3.0 - 1.3.8, 1.2.0, 1.1.0 - 1.1.4, 1.0.0

---

External links
http://www.debian.org/security/2021/dsa-4850

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.