EulerOS 2.0 SP10 : byacc (EulerOS-SA-2023-1520)

critical Nessus Plugin ID 172688


The remote EulerOS host is missing multiple security updates.


According to the versions of the byacc packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

- When processing files, malloc stores the data of the current line. When processing comments, malloc incorrectly accesses the released memory (use after free). (CVE-2021-33641)

- When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Update the affected byacc packages.

See Also

Plugin Details

Severity: Critical

ID: 172688

File Name: EulerOS_SA-2023-1520.nasl

Version: 1.0

Type: local

Published: 3/19/2023

Updated: 3/19/2023

Risk Information


Risk Factor: Medium

Score: 6.7


Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: E:U/RL:OF/RC:C

CVSS Score Source: CVE-2021-33641


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:huawei:euleros:byacc, p-cpe:/a:huawei:euleros:byacc-help, cpe:/o:huawei:euleros:2.0

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/sp

Excluded KB Items: Host/EulerOS/uvp_version

Exploit Ease: No known exploits are available

Patch Publication Date: 3/18/2023

Vulnerability Publication Date: 1/20/2023

Reference Information

CVE: CVE-2021-33641, CVE-2021-33642