#VU20060 Race condition in Zstandard - CVE-2019-11922

Vulnerability identifier: #VU20060

Vulnerability risk: Medium

CVSSv4.0: 4.8 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-11922

CWE-ID: CWE-362

Exploitation vector: Network

Exploit availability: No

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

Vendor: Facebook Inc.

Description

The vulnerability allows an attacker to execute arbitrary code on the target system.

The vulnerability exists due to a race condition in the one-pass compression functions. A remote attacker can exploit the race and write bytes out of bounds if an output buffer smaller than the recommended size was used.

Successful exploitation of the vulnerability may allow an attacker to execute arbitrary code on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Zstandard: 1.3.0 - 1.3.7

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External links
https://github.com/facebook/zstd/pull/1404/commits/3e5cdf1b6a85843e991d7d10f6a2567c15580da0
https://www.facebook.com/security/advisories/cve-2019-11922

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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.