[USN-7206-2] rsync regression

[Sudhakar Verma]

==========================================================================
Ubuntu Security Notice USN-7206-2
January 16, 2025

rsync regression
==========================================================================

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

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

USN-7206-1 caused some regression in rsync.

Software Description:
- rsync: fast, versatile, remote (and local) file-copying tool

Details:

USN-7206-1 fixed vulnerabilities in rsync. The update introduced a
regression in rsync. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

  Simon Scannell, Pedro Gallegos, and Jasiel Spelman discovered that rsync
  did not properly handle checksum lengths. An attacker could use this
  issue to execute arbitrary code. (CVE-2024-12084)

  Simon Scannell, Pedro Gallegos, and Jasiel Spelman discovered that rsync
  compared checksums with uninitialized memory. An attacker could exploit
  this issue to leak sensitive information. (CVE-2024-12085)

  Simon Scannell, Pedro Gallegos, and Jasiel Spelman discovered that rsync
  incorrectly handled file checksums. A malicious server could use this
  to expose arbitrary client files. (CVE-2024-12086)

  Simon Scannell, Pedro Gallegos, and Jasiel Spelman discovered that rsync
  mishandled symlinks for some settings. An attacker could exploit this
  to write files outside the intended directory. (CVE-2024-12087)

  Simon Scannell, Pedro Gallegos, and Jasiel Spelman discovered that rsync
  failed to verify symbolic link destinations for some settings. An
  attacker could exploit this for path traversal attacks. (CVE-2024-12088)

  Aleksei Gorban discovered a race condition in rsync's handling of
  symbolic links. An attacker could use this to access sensitive
  information or escalate privileges. (CVE-2024-12747)

Update instructions:

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

Ubuntu 24.04 LTS
   rsync                           3.2.7-1ubuntu1.2

Ubuntu 22.04 LTS
   rsync                           3.2.7-0ubuntu0.22.04.4

Ubuntu 20.04 LTS
   rsync                           3.1.3-8ubuntu0.9

Ubuntu 18.04 LTS
   rsync                           3.1.2-2.1ubuntu1.6+esm2
                                   Available with Ubuntu Pro

Ubuntu 16.04 LTS
   rsync                           3.1.1-3ubuntu1.3+esm4
                                   Available with Ubuntu Pro

Ubuntu 14.04 LTS
   rsync                           3.1.0-2ubuntu0.4+esm2
                                   Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.
After a standard system update you need to restart rsync daemons if
configured to make all the necessary changes.

References:
   https://ubuntu.com/security/notices/USN-7206-2
   https://ubuntu.com/security/notices/USN-7206-1
   https://launchpad.net/bugs/2095004

Package Information:
   https://launchpad.net/ubuntu/+source/rsync/3.2.7-1ubuntu1.2
   https://launchpad.net/ubuntu/+source/rsync/3.2.7-0ubuntu0.22.04.4
   https://launchpad.net/ubuntu/+source/rsync/3.1.3-8ubuntu0.9