Advisory Published

USN-6990-1: znc vulnerability

First published: Wed Sep 04 2024(Updated: )

Johannes Kuhn (DasBrain) discovered that znc incorrectly handled user input under certain operations. An attacker could possibly use this issue to execute arbitrary code on a user's system if the user was tricked into joining a malicious server.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/znc<1.9.0-2ubuntu0.1~esm2
1.9.0-2ubuntu0.1~esm2
Ubuntu=24.04
All of
ubuntu/znc-dev<1.9.0-2ubuntu0.1~esm2
1.9.0-2ubuntu0.1~esm2
Ubuntu=24.04
All of
ubuntu/znc-perl<1.9.0-2ubuntu0.1~esm2
1.9.0-2ubuntu0.1~esm2
Ubuntu=24.04
All of
ubuntu/znc-python<1.9.0-2ubuntu0.1~esm2
1.9.0-2ubuntu0.1~esm2
Ubuntu=24.04
All of
ubuntu/znc-tcl<1.9.0-2ubuntu0.1~esm2
1.9.0-2ubuntu0.1~esm2
Ubuntu=24.04
All of
ubuntu/znc<1.8.2-2ubuntu0.1
1.8.2-2ubuntu0.1
Ubuntu=22.04
All of
ubuntu/znc-dev<1.8.2-2ubuntu0.1
1.8.2-2ubuntu0.1
Ubuntu=22.04
All of
ubuntu/znc-perl<1.8.2-2ubuntu0.1
1.8.2-2ubuntu0.1
Ubuntu=22.04
All of
ubuntu/znc-python<1.8.2-2ubuntu0.1
1.8.2-2ubuntu0.1
Ubuntu=22.04
All of
ubuntu/znc-tcl<1.8.2-2ubuntu0.1
1.8.2-2ubuntu0.1
Ubuntu=22.04
All of
ubuntu/znc<1.7.5-4ubuntu0.1~esm2
1.7.5-4ubuntu0.1~esm2
Ubuntu=20.04
All of
ubuntu/znc-dev<1.7.5-4ubuntu0.1~esm2
1.7.5-4ubuntu0.1~esm2
Ubuntu=20.04
All of
ubuntu/znc-perl<1.7.5-4ubuntu0.1~esm2
1.7.5-4ubuntu0.1~esm2
Ubuntu=20.04
All of
ubuntu/znc-python<1.7.5-4ubuntu0.1~esm2
1.7.5-4ubuntu0.1~esm2
Ubuntu=20.04
All of
ubuntu/znc-tcl<1.7.5-4ubuntu0.1~esm2
1.7.5-4ubuntu0.1~esm2
Ubuntu=20.04
All of
ubuntu/znc<1.6.6-1ubuntu0.2+esm2
1.6.6-1ubuntu0.2+esm2
Ubuntu=18.04
All of
ubuntu/znc-dev<1.6.6-1ubuntu0.2+esm2
1.6.6-1ubuntu0.2+esm2
Ubuntu=18.04
All of
ubuntu/znc-perl<1.6.6-1ubuntu0.2+esm2
1.6.6-1ubuntu0.2+esm2
Ubuntu=18.04
All of
ubuntu/znc-python<1.6.6-1ubuntu0.2+esm2
1.6.6-1ubuntu0.2+esm2
Ubuntu=18.04
All of
ubuntu/znc-tcl<1.6.6-1ubuntu0.2+esm2
1.6.6-1ubuntu0.2+esm2
Ubuntu=18.04
All of
ubuntu/znc<1.6.3-1ubuntu0.2+esm2
1.6.3-1ubuntu0.2+esm2
Ubuntu=16.04
All of
ubuntu/znc-dev<1.6.3-1ubuntu0.2+esm2
1.6.3-1ubuntu0.2+esm2
Ubuntu=16.04
All of
ubuntu/znc-perl<1.6.3-1ubuntu0.2+esm2
1.6.3-1ubuntu0.2+esm2
Ubuntu=16.04
All of
ubuntu/znc-python<1.6.3-1ubuntu0.2+esm2
1.6.3-1ubuntu0.2+esm2
Ubuntu=16.04
All of
ubuntu/znc-tcl<1.6.3-1ubuntu0.2+esm2
1.6.3-1ubuntu0.2+esm2
Ubuntu=16.04
All of
ubuntu/znc<1.2-3ubuntu0.1+esm3
1.2-3ubuntu0.1+esm3
Ubuntu=14.04
All of
ubuntu/znc-dev<1.2-3ubuntu0.1+esm3
1.2-3ubuntu0.1+esm3
Ubuntu=14.04
All of
ubuntu/znc-perl<1.2-3ubuntu0.1+esm3
1.2-3ubuntu0.1+esm3
Ubuntu=14.04
All of
ubuntu/znc-python<1.2-3ubuntu0.1+esm3
1.2-3ubuntu0.1+esm3
Ubuntu=14.04
All of
ubuntu/znc-tcl<1.2-3ubuntu0.1+esm3
1.2-3ubuntu0.1+esm3
Ubuntu=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-6990-1?

    The severity of USN-6990-1 is high due to the potential for arbitrary code execution.

  • How do I fix USN-6990-1?

    To fix USN-6990-1, update znc to version 1.9.0-2ubuntu0.1~esm2 or later if you are on Ubuntu 24.04.

  • Which versions of znc are affected by USN-6990-1?

    USN-6990-1 affects znc versions prior to 1.9.0-2ubuntu0.1~esm2 on specific Ubuntu releases.

  • What can an attacker do with the vulnerability in USN-6990-1?

    An attacker could execute arbitrary code on a user's system by tricking them into joining a malicious server.

  • Is USN-6990-1 relevant for older Ubuntu versions?

    Yes, USN-6990-1 is relevant for multiple older Ubuntu versions as well as the latest release.

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