Debian has issued two security advisories: DLA-4326-1 for Asterisk on Debian GNU/Linux 11 (Bullseye) LTS and DSA-6023-1 for Tiff on both Debian GNU/Linux 12 (Bookworm) and 13 (Trixie). The Asterisk advisory (DLA-4326-1) fixes two vulnerabilities, including a local privilege escalation vulnerability in the safe_asterisk script and a lack of session termination that can lead to resource exhaustion. The Tiff advisory (DSA-6023-1) fixes a denial-of-service or potentially arbitrary code execution vulnerability caused by missing input sanitizing in the libtiff library.

[DLA 4326-1] asterisk security update
[DSA 6023-1] tiff security update

[SECURITY] [DLA 4326-1] asterisk security update

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Debian LTS Advisory DLA-4326-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Markus Koschany
October 10, 2025 https://wiki.debian.org/LTS
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Package : asterisk
Version : 1:16.28.0~dfsg-0+deb11u8
CVE ID : CVE-2025-1131 CVE-2025-54995

Two security vulnerabilities have been discovered in Asterisk, an Open
Source Private Branch Exchange.

CVE-2025-1131

A local privilege escalation vulnerability exists in the safe_asterisk
script included with the Asterisk toolkit package. When Asterisk is started
via this script, it sources all .sh files located in
/etc/asterisk/startup.d/ as root, without validating ownership or
permissions. Non-root users with legitimate write access to /etc/asterisk
can exploit this behaviour by placing malicious scripts in the startup.d
directory, which will then execute with root privileges upon service
restart. Default Debian installations are not affected by this problem.

CVE-2025-54995

Prior to this version, RTP UDP ports and internal resources can leak due to
a lack of session termination. This could result in resource exhaustion.

For Debian 11 bullseye, these problems have been fixed in version
1:16.28.0~dfsg-0+deb11u8.

We recommend that you upgrade your asterisk packages.

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

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS

[SECURITY] [DSA 6023-1] tiff security update

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Debian Security Advisory DSA-6023-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
October 10, 2025 https://www.debian.org/security/faq
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Package : tiff
CVE ID : CVE-2025-9900

It was discovered that missing input sanitising in the libtiff library
could result in denial of service or potentially the execution of
arbitrary code if malformed image files are processed.

For the oldstable distribution (bookworm), this problem has been fixed
in version 4.5.0-6+deb12u3.

For the stable distribution (trixie), this problem has been fixed in
version 4.7.0-3+deb13u1.

We recommend that you upgrade your tiff packages.

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/