ALAS2023-2025-1140

References: CVE-2025-32988  CVE-2025-32989  CVE-2025-32990  CVE-2025-6395 
FAQs regarding Amazon Linux ALAS/CVE Severity

Issue Overview:

A flaw was found in GnuTLS. A double-free vulnerability exists in GnuTLS due to incorrect ownership handling in the export logic of Subject Alternative Name (SAN) entries containing an otherName. If the type-id OID is invalid or malformed, GnuTLS will call asn1_delete_structure() on an ASN.1 node it does not own, leading to a double-free condition when the parent function or caller later attempts to free the same structure.

This vulnerability can be triggered using only public GnuTLS APIs and may result in denial of service or memory corruption, depending on allocator behavior. (CVE-2025-32988)

A heap-buffer-overread vulnerability was found in GnuTLS in how it handles the Certificate Transparency (CT) Signed Certificate Timestamp (SCT) extension during X.509 certificate parsing. This flaw allows a malicious user to create a certificate containing a malformed SCT extension (OID 1.3.6.1.4.1.11129.2.4.2) that contains sensitive data. This issue leads to the exposure of confidential information when GnuTLS verifies certificates from certain websites when the certificate (SCT) is not checked correctly. (CVE-2025-32989)

A heap-buffer-overflow (off-by-one) flaw was found in the GnuTLS software in the template parsing logic within the certtool utility. When it reads certain settings from a template file, it allows an attacker to cause an out-of-bounds (OOB) NULL pointer write, resulting in memory corruption and a denial-of-service (DoS) that could potentially crash the system. (CVE-2025-32990)

A NULL pointer dereference flaw was found in the GnuTLS software in _gnutls_figure_common_ciphersuite(). When it reads certain settings from a template file, it can allow an attacker to cause an out-of-bounds (OOB) NULL pointer write, resulting in memory corruption and a denial of service (DoS) that could crash the system. (CVE-2025-6395)

Issue Correction:
Run dnf update gnutls --releasever 2023.8.20250818 or dnf update --advisory ALAS2023-2025-1140 --releasever 2023.8.20250818 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation

New Packages:

aarch64:
    gnutls-c++-debuginfo-3.8.3-8.amzn2023.0.1.aarch64
    gnutls-debuginfo-3.8.3-8.amzn2023.0.1.aarch64
    gnutls-dane-3.8.3-8.amzn2023.0.1.aarch64
    gnutls-dane-debuginfo-3.8.3-8.amzn2023.0.1.aarch64
    gnutls-utils-debuginfo-3.8.3-8.amzn2023.0.1.aarch64
    gnutls-utils-3.8.3-8.amzn2023.0.1.aarch64
    gnutls-c++-3.8.3-8.amzn2023.0.1.aarch64
    gnutls-3.8.3-8.amzn2023.0.1.aarch64
    gnutls-debugsource-3.8.3-8.amzn2023.0.1.aarch64
    gnutls-devel-3.8.3-8.amzn2023.0.1.aarch64

src:
    gnutls-3.8.3-8.amzn2023.0.1.src

x86_64:
    gnutls-debuginfo-3.8.3-8.amzn2023.0.1.x86_64
    gnutls-utils-debuginfo-3.8.3-8.amzn2023.0.1.x86_64
    gnutls-c++-debuginfo-3.8.3-8.amzn2023.0.1.x86_64
    gnutls-dane-debuginfo-3.8.3-8.amzn2023.0.1.x86_64
    gnutls-c++-3.8.3-8.amzn2023.0.1.x86_64
    gnutls-dane-3.8.3-8.amzn2023.0.1.x86_64
    gnutls-utils-3.8.3-8.amzn2023.0.1.x86_64
    gnutls-3.8.3-8.amzn2023.0.1.x86_64
    gnutls-debugsource-3.8.3-8.amzn2023.0.1.x86_64
    gnutls-devel-3.8.3-8.amzn2023.0.1.x86_64