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

The remote Redhat Enterprise Linux 7 host has one or more packages installed that are affected by multiple vulnerabilities that have been acknowledged by the vendor but will not be patched.

  - byacc: malloc incorrectly accessing released memory leads to use after free (CVE-2021-33641)

  - When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.
    (CVE-2021-33642)

Note that Nessus has not tested for these issues but has instead relied on the package manager's report that the package is installed.

This plugin has been deprecated as it does not adhere to established standards for this style of check.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2023-204 advisory.

    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.
    (CVE-2021-33642)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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.
    (CVE-2021-33642)

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.

ID	Name	Product	Family	Severity
200039	RHEL 7 : byacc (Unpatched Vulnerability)	Nessus	Red Hat Local Security Checks	high
196347	RHEL 6 : byacc (Unpatched Vulnerability) (deprecated)	Nessus	Red Hat Local Security Checks	high
176917	Amazon Linux 2023 : byacc (ALAS2023-2023-204)	Nessus	Amazon Linux Local Security Checks	high
175255	EulerOS 2.0 SP11 : byacc (EulerOS-SA-2023-1756)	Nessus	Huawei Local Security Checks	high
175238	EulerOS 2.0 SP11 : byacc (EulerOS-SA-2023-1778)	Nessus	Huawei Local Security Checks	high
172700	EulerOS 2.0 SP10 : byacc (EulerOS-SA-2023-1545)	Nessus	Huawei Local Security Checks	high
172688	EulerOS 2.0 SP10 : byacc (EulerOS-SA-2023-1520)	Nessus	Huawei Local Security Checks	high
172337	EulerOS 2.0 SP9 : byacc (EulerOS-SA-2023-1436)	Nessus	Huawei Local Security Checks	high
172319	EulerOS 2.0 SP9 : byacc (EulerOS-SA-2023-1461)	Nessus	Huawei Local Security Checks	high

Detections

Analytics

CVE-2021-33642

medium

Tenable Plugins

high

high

high

high

high

high

high

high

high