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Ubuntu Security Notice USN-6755-1
April 29, 2024

cpio vulnerabilities

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

• Ubuntu 23.10
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS

Summary:

GNU cpio could be made to write files outside the target directory.

Software Description:

• cpio: a tool to manage archives of files

Details:

Ingo Brückl discovered that cpio contained a path traversal vulnerability.
If a user or automated system were tricked into extracting a specially
crafted cpio archive, an attacker could possibly use this issue to write
arbitrary files outside the target directory on the host, even if using the
option --no-absolute-filenames.

Update instructions:

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

Ubuntu 23.10
cpio 2.13+dfsg-7.1ubuntu0.1

Ubuntu 22.04 LTS
cpio 2.13+dfsg-7ubuntu0.1

Ubuntu 20.04 LTS
cpio 2.13+dfsg-2ubuntu0.4

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

References:
https://ubuntu.com/security/notices/USN-6755-1
CVE-2023-7207

Package Information:
https://launchpad.net/ubuntu/+source/cpio/2.13+dfsg-7.1ubuntu0.1
https://launchpad.net/ubuntu/+source/cpio/2.13+dfsg-7ubuntu0.1
https://launchpad.net/ubuntu/+source/cpio/2.13+dfsg-2ubuntu0.4