Debian dla-4515 : asterisk - security update

high Nessus Plugin ID 304310

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4515 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4515-1 [email protected] https://www.debian.org/lts/security/ Lukas Mrdian March 29, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : asterisk Version : 1:16.28.0~dfsg-0+deb11u9 CVE ID : CVE-2026-23738 CVE-2026-23739 CVE-2026-23740 CVE-2026-23741 Debian Bug : 1127438

Multiple vulnerabilities were discovered in asterisk, an Open Source Private Branch Exchange (PBX) and telephony toolkit.

CVE-2026-23738

XSS vulnerability in the /httpstatus page. Cookie names/values and GET parameter names/values are rendered without HTML-escaping, allowing reflected cross-site scripting attacks. The status page is now also disabled by default.

CVE-2026-23739

XXE injection vulnerability in xml.c. The XML parsing functions allow external entity processing which can be exploited for XML External Entity injection attacks via network-based entity resolution.

CVE-2026-23740

Privilege escalation via ast_coredumper gdbinit file permissions. The script creates temporary files with default umask permissions, potentially allowing local users to read or tamper with sensitive debugging data.

CVE-2026-23741

Privilege escalation via ast_coredumper sourcing configuration files without ownership or permission checks. When running as root, a non-root user could place a malicious config file that gets sourced with root privileges.

For Debian 11 bullseye, these problems have been fixed in version 1:16.28.0~dfsg-0+deb11u9.

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 Attachment:
signature.asc Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian 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

Upgrade the asterisk packages.

Plugin Details

Severity: High

ID: 304310

File Name: debian_DLA-4515.nasl

Version: 1.1

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 3/30/2026

Updated: 3/30/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-23741

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:asterisk-mp3, p-cpe:/a:debian:debian_linux:asterisk-tests, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:asterisk, p-cpe:/a:debian:debian_linux:asterisk-mysql, p-cpe:/a:debian:debian_linux:asterisk-doc, p-cpe:/a:debian:debian_linux:asterisk-vpb, p-cpe:/a:debian:debian_linux:asterisk-dahdi, p-cpe:/a:debian:debian_linux:asterisk-voicemail, p-cpe:/a:debian:debian_linux:asterisk-dev, p-cpe:/a:debian:debian_linux:asterisk-ooh323, p-cpe:/a:debian:debian_linux:asterisk-modules, p-cpe:/a:debian:debian_linux:asterisk-voicemail-imapstorage, p-cpe:/a:debian:debian_linux:asterisk-voicemail-odbcstorage, p-cpe:/a:debian:debian_linux:asterisk-mobile, p-cpe:/a:debian:debian_linux:asterisk-config

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 3/29/2026

Vulnerability Publication Date: 2/6/2026

Reference Information

CVE: CVE-2026-23738, CVE-2026-23739, CVE-2026-23740, CVE-2026-23741

Detections

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