[USN-6756-1] less vulnerability

Fabian Toepfer fabian.toepfer at canonical.com
Mon Apr 29 11:33:16 UTC 2024

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


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

Software Description:
- less: pager program similar to more


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.


Package Information:

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