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Amazon Linux 2023 : clamav1.5, clamav1.5-data, clamav1.5-devel (ALAS2023-2026-1870)

critical Nessus Plugin ID 322005

Synopsis

The remote Amazon Linux 2023 host is missing a security update.

Description

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1870 advisory.

 rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) sets len = buf.len() and passes it as the in/out length to EVP_PKEY_derive, relying on OpenSSL to honor it. On OpenSSL 1.1.x, X25519, X448, DH and HKDF-extract ignore the incoming *keylen, unconditionally writing the full shared secret (32/56/prime-size bytes). A caller passing a short slice gets a heap/stack overflow from safe code. OpenSSL 3.x providers do check, so this only impacts older OpenSSL. This vulnerability is fixed in 0.10.78. (CVE-2026-41676)

 rust-openssl provides OpenSSL bindings for the Rust programming language. From to before 0.10.78, aes::unwrap_key() contains an incorrect assertion: it checks that out.len() + 8 <= in_.len(), but this condition is reversed. The intended invariant is out.len() >= in_.len() - 8, ensuring the output buffer is large enough. Because of the inverted check, the function only accepts buffers at or below the minimum required size and rejects larger ones. If a smaller buffer is provided the function will write past the end of out by in_.len() - 8 - out.len() bytes, causing an out-of-bounds write from a safe public function.
 This vulnerability is fixed in 0.10.78. (CVE-2026-41678)

 rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.7 to before 0.10.79, X509Ref::ocsp_responders returns OCSP responder URLs from a certificate's AIA extension as OpensslString, whose Deref<Target = str> wraps the raw bytes with str::from_utf8_unchecked. OpenSSL does not enforce that the underlying IA5String is ASCII, so a certificate with non-UTF-8 bytes in its OCSP accessLocation causes safe Rust code to construct a &str that violates the UTF-8 invariant -- resulting in undefined behavior.
 This vulnerability is fixed in 0.10.79. (CVE-2026-42327)

 rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.10.0 to before 0.10.79, CipherCtxRef::cipher_update, CipherCtxRef::cipher_update_vec, and symm::Crypter::update incorrectly sized output buffers when used with AES key-wrap-with-padding ciphers (EVP_aes_{128,192,256}_wrap_pad). For a non-multiple-of-8 input, OpenSSL writes up to 7 bytes past the end of the caller's buffer or Vec, producing attacker-controllable heap corruption when the plaintext length is attacker-influenced. This only impacts users using AES key-wrap-with-padding ciphers. This vulnerability is fixed in 0.10.79.
 (CVE-2026-44662)

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.

Solution

Run 'dnf update clamav1.5 --releasever 2023.12.20260622' or or 'dnf update --advisory ALAS2023-2026-1870 --releasever 2023.12.20260622' to update your system.

See Also

https://alas.aws.amazon.com//AL2023/ALAS2023-2026-1870.html

https://alas.aws.amazon.com/faqs.html

https://explore.alas.aws.amazon.com/CVE-2026-41676.html

https://explore.alas.aws.amazon.com/CVE-2026-41678.html

https://explore.alas.aws.amazon.com/CVE-2026-42327.html

https://explore.alas.aws.amazon.com/CVE-2026-44662.html

Plugin Details

Severity: Critical

ID: 322005

File Name: al2023_ALAS2023-2026-1870.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/22/2026

Updated: 6/22/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-41678

CVSS v3

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: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.2

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:clamav1.5-lib, p-cpe:/a:amazon:linux:clamav1.5, p-cpe:/a:amazon:linux:clamav1.5-freshclam, p-cpe:/a:amazon:linux:clamav1.5-debugsource, p-cpe:/a:amazon:linux:clamav1.5-devel, p-cpe:/a:amazon:linux:clamav1.5-debuginfo, p-cpe:/a:amazon:linux:clamav1.5-data, p-cpe:/a:amazon:linux:clamav1.5-milter, p-cpe:/a:amazon:linux:clamd1.5-debuginfo, cpe:/o:amazon:linux:2023, p-cpe:/a:amazon:linux:clamav1.5-doc, p-cpe:/a:amazon:linux:clamd1.5, p-cpe:/a:amazon:linux:clamav1.5-freshclam-debuginfo, p-cpe:/a:amazon:linux:clamav1.5-filesystem, p-cpe:/a:amazon:linux:clamav1.5-lib-debuginfo, p-cpe:/a:amazon:linux:clamav1.5-milter-debuginfo

Required KB Items: Host/local_checks_enabled, Host/AmazonLinux/release, Host/AmazonLinux/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 6/22/2026

Vulnerability Publication Date: 4/22/2026

Reference Information

CVE: CVE-2026-41676, CVE-2026-41678, CVE-2026-42327, CVE-2026-44662