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

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

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

Note that Nessus relies on the presence of the package as reported by the vendor.

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
223805	Linux Distros Unpatched Vulnerability : CVE-2021-33642	Nessus	Misc.	medium
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

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CVE-2021-33642

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