Amazon Linux 2023 Security Advisory: ALAS2023-2026-3290
Advisory Released Date: 2026-10-24
Advisory Updated Date: 2026-10-26
Severity:
Important
Issue Overview:
A heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST-MD5 plugin computes the size of the buffer needed for a challenge/response field before DIGEST-MD5 quoting is applied, but does not recompute that size when quoting (escaping special characters) makes the value longer. The under-sized buffer is then passed to strcat(), causing a heap-based out-of-bounds write whose size depends on attacker-controlled input. A malicious or on-path DIGEST-MD5 (or HTTP Digest) server can trigger this flaw in a connecting client by supplying a crafted challenge field, such as realm or nonce, most likely resulting in a crash of the client application. (CVE-2026-107161)
Affected Packages:
cyrus-sasl
Issue Correction:
Run dnf update cyrus-sasl --releasever 2023.12.20261026 or dnf update --advisory ALAS2023-2026-3290 --releasever 2023.12.20261026 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:
cyrus-sasl-sql-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-debugsource-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-plain-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-ldap-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-ldap-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-scram-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-md5-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-plain-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-gssapi-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-gs2-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-ntlm-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-lib-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-md5-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-sql-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-devel-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-lib-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-devel-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-scram-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-gssapi-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-ntlm-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
cyrus-sasl-gs2-debuginfo-2.1.27-18.amzn2023.0.4.aarch64
src:
cyrus-sasl-2.1.27-18.amzn2023.0.4.src
x86_64:
cyrus-sasl-debugsource-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-plain-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-scram-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-lib-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-gssapi-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-ldap-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-gssapi-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-ntlm-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-md5-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-md5-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-plain-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-gs2-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-ldap-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-ntlm-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-scram-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-sql-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-sql-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-gs2-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-lib-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-devel-debuginfo-2.1.27-18.amzn2023.0.4.x86_64
cyrus-sasl-devel-2.1.27-18.amzn2023.0.4.x86_64