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

  - Rejected reason: DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: none. Further investigation showed that it     was not a security issue. Notes: none (CVE-2020-26159)

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

The version of oniguruma installed on the remote host is prior to 5.9.6-1. It is, therefore, affected by a vulnerability as referenced in the ALAS2-2020-1560 advisory.

    In Oniguruma 6.9.5_rev1, an attacker able to supply a regular expression for compilation may be able to     overflow a buffer by one byte in concat_opt_exact_str in src/regcomp.c . (CVE-2020-26159)

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

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

Backport fix for CVE-2020-26159

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

It was discovered that CVE-2020-26159 in the Oniguruma regular expressions library, notably used in PHP mbstring, was a false-positive. In consequence the patch for CVE-2020-26159 was reverted. For reference, the original advisory text follows.

CVE-2020-26159

In Oniguruma an attacker able to supply a regular expression for compilation may be able to overflow a buffer by one byte in concat_opt_exact_str in src/regcomp.c

For Debian 9 stretch, this problem has been fixed in version 6.1.3-2+deb9u2.

We recommend that you upgrade your libonig packages.

For the detailed security status of libonig please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libonig

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

An update of the oniguruma package has been released.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2024:2993-1 advisory.

    - CVE-2020-26159: Fixed buffer overflow in concat_opt_exact_str could that could lead in DoS (bsc#1177179)

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

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

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2022:3327-1 advisory.

  - A use-after-free in onig_new_deluxe() in regext.c in Oniguruma 6.9.2 allows attackers to potentially cause     information disclosure, denial of service, or possibly code execution by providing a crafted regular     expression. The attacker provides a pair of a regex pattern and a string, with a multi-byte encoding that     gets handled by onig_new_deluxe(). Oniguruma issues often affect Ruby, as well as common optional     libraries for PHP and Rust. (CVE-2019-13224)

  - Oniguruma before 6.9.3 allows Stack Exhaustion in regcomp.c because of recursion in regparse.c.
    (CVE-2019-16163)

  - An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file     gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string.
    This leads to a heap-based buffer over-read. (CVE-2019-19203)

  - An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function fetch_interval_quantifier     (formerly known as fetch_range_quantifier) in regparse.c, PFETCH is called without checking PEND. This     leads to a heap-based buffer over-read. (CVE-2019-19204)

  - Oniguruma through 6.9.3, as used in PHP 7.3.x and other products, has a heap-based buffer over-read in     str_lower_case_match in regexec.c. (CVE-2019-19246)

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

ID	Name	Product	Family	Published	Updated	Severity
223487	Linux Distros Unpatched Vulnerability : CVE-2020-26159	Nessus	Misc.	3/4/2025	3/4/2025	high
142733	Amazon Linux 2 : oniguruma (ALAS-2020-1560)	Nessus	Amazon Linux Local Security Checks	11/11/2020	12/11/2024	high
141297	Fedora 33 : oniguruma (2020-bc758654d1)	Nessus	Fedora Local Security Checks	10/8/2020	10/20/2020	high
141386	Fedora 31 : oniguruma (2020-d53469eceb)	Nessus	Fedora Local Security Checks	10/12/2020	10/20/2020	high
142546	Debian DLA-2431-2 : libonig regression update	Nessus	Debian Local Security Checks	11/6/2020	2/1/2021	high
141864	Photon OS 3.0: Oniguruma PHSA-2020-3.0-0155	Nessus	PhotonOS Local Security Checks	10/24/2020	7/24/2024	high
141643	Photon OS 2.0: Oniguruma PHSA-2020-2.0-0291	Nessus	PhotonOS Local Security Checks	10/21/2020	7/23/2024	high
141376	Fedora 32 : oniguruma (2020-952c499e9d)	Nessus	Fedora Local Security Checks	10/12/2020	10/20/2020	high
206087	SUSE SLES12 Security Update : oniguruma (SUSE-SU-2024:2993-1)	Nessus	SuSE Local Security Checks	8/22/2024	8/22/2024	medium
165304	SUSE SLED15 / SLES15 Security Update : oniguruma (SUSE-SU-2022:3327-1)	Nessus	SuSE Local Security Checks	9/22/2022	11/8/2023	critical

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