Ubuntu update for libzstd

1) Race condition

EUVDB-ID: #VU20060

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 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

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

Update the affected package libzstd to the latest version.

Vulnerable software versions

Ubuntu: 16.04

libzstd1 (Ubuntu package): before 1.3.1+dfsg1~ubuntu0.16.04.1+esm2

zstd (Ubuntu package): before 1.3.1+dfsg1~ubuntu0.16.04.1+esm2

CPE2.3

• cpe:2.3:o:canonical:ubuntu:16.04:*:*:*:*:*:*:*
• cpe:2.3:a:canonical:libzstd1_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:a:canonical:zstd_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-5593-1

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.