Advisory Published

USN-6841-1: PHP vulnerability

First published: Wed Jun 19 2024(Updated: )

It was discovered that PHP could early return in the filter_var function resulting in invalid user information being treated as valid user information. An attacker could possibly use this issue to expose raw user input information.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libapache2-mod-php8.3<8.3.6-0ubuntu0.24.04.1
8.3.6-0ubuntu0.24.04.1
Ubuntu=24.04
All of
ubuntu/php8.3<8.3.6-0ubuntu0.24.04.1
8.3.6-0ubuntu0.24.04.1
Ubuntu=24.04
All of
ubuntu/php8.3-cgi<8.3.6-0ubuntu0.24.04.1
8.3.6-0ubuntu0.24.04.1
Ubuntu=24.04
All of
ubuntu/php8.3-cli<8.3.6-0ubuntu0.24.04.1
8.3.6-0ubuntu0.24.04.1
Ubuntu=24.04
All of
ubuntu/php8.3-fpm<8.3.6-0ubuntu0.24.04.1
8.3.6-0ubuntu0.24.04.1
Ubuntu=24.04
All of
ubuntu/libapache2-mod-php8.2<8.2.10-2ubuntu2.2
8.2.10-2ubuntu2.2
Ubuntu=23.10
All of
ubuntu/php8.2<8.2.10-2ubuntu2.2
8.2.10-2ubuntu2.2
Ubuntu=23.10
All of
ubuntu/php8.2-cgi<8.2.10-2ubuntu2.2
8.2.10-2ubuntu2.2
Ubuntu=23.10
All of
ubuntu/php8.2-cli<8.2.10-2ubuntu2.2
8.2.10-2ubuntu2.2
Ubuntu=23.10
All of
ubuntu/php8.2-fpm<8.2.10-2ubuntu2.2
8.2.10-2ubuntu2.2
Ubuntu=23.10
All of
ubuntu/libapache2-mod-php8.1<8.1.2-1ubuntu2.18
8.1.2-1ubuntu2.18
Ubuntu=22.04
All of
ubuntu/php8.1<8.1.2-1ubuntu2.18
8.1.2-1ubuntu2.18
Ubuntu=22.04
All of
ubuntu/php8.1-cgi<8.1.2-1ubuntu2.18
8.1.2-1ubuntu2.18
Ubuntu=22.04
All of
ubuntu/php8.1-cli<8.1.2-1ubuntu2.18
8.1.2-1ubuntu2.18
Ubuntu=22.04
All of
ubuntu/php8.1-fpm<8.1.2-1ubuntu2.18
8.1.2-1ubuntu2.18
Ubuntu=22.04
All of
ubuntu/libapache2-mod-php7.4<7.4.3-4ubuntu2.23
7.4.3-4ubuntu2.23
Ubuntu=20.04
All of
ubuntu/php7.4<7.4.3-4ubuntu2.23
7.4.3-4ubuntu2.23
Ubuntu=20.04
All of
ubuntu/php7.4-cgi<7.4.3-4ubuntu2.23
7.4.3-4ubuntu2.23
Ubuntu=20.04
All of
ubuntu/php7.4-cli<7.4.3-4ubuntu2.23
7.4.3-4ubuntu2.23
Ubuntu=20.04
All of
ubuntu/php7.4-fpm<7.4.3-4ubuntu2.23
7.4.3-4ubuntu2.23
Ubuntu=20.04

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Reference Links

Frequently Asked Questions

  • What is the severity of USN-6841-1?

    The severity of USN-6841-1 is considered high due to the potential exposure of raw user input information.

  • How do I fix USN-6841-1?

    To fix USN-6841-1, upgrade to the patched PHP versions provided in the security notice.

  • Which PHP versions are affected by USN-6841-1?

    USN-6841-1 affects PHP versions 8.3, 8.2, 8.1, and 7.4 across various Ubuntu releases.

  • What are the potential consequences of USN-6841-1?

    If exploited, USN-6841-1 could allow attackers to manipulate user information and bypass validation checks.

  • Is there a workaround for USN-6841-1?

    There is no official workaround for USN-6841-1, and the recommended action is to apply the updates provided.

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