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Ubuntu Security Notice USN-6756-1
April 29, 2024

less vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 24.04 LTS
• Ubuntu 23.10
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 LTS
• Ubuntu 16.04 LTS
• Ubuntu 14.04 LTS

Summary:

less could be made run programs as your login if it opened a specially
crafted file.

Software Description:

• less: pager program similar to more

Details:

It was discovered that less mishandled newline characters in file names. If
a user or automated system were tricked into opening specially crafted
files, an attacker could possibly use this issue to execute arbitrary
commands on the host.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
less 590-2ubuntu2.1

Ubuntu 23.10
less 590-2ubuntu0.23.10.2

Ubuntu 22.04 LTS
less 590-1ubuntu0.22.04.3

Ubuntu 20.04 LTS
less 551-1ubuntu0.3

Ubuntu 18.04 LTS
less 487-0.1ubuntu0.1~esm2
Available with Ubuntu Pro

Ubuntu 16.04 LTS
less 481-2.1ubuntu0.2+esm2
Available with Ubuntu Pro

Ubuntu 14.04 LTS
less 458-2ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6756-1
CVE-2024-32487

Package Information:
https://launchpad.net/ubuntu/+source/less/590-2ubuntu2.1
https://launchpad.net/ubuntu/+source/less/590-2ubuntu0.23.10.2
https://launchpad.net/ubuntu/+source/less/590-1ubuntu0.22.04.3
https://launchpad.net/ubuntu/+source/less/551-1ubuntu0.3