=========================================================================Ubuntu Security Notice USN-5009-2
October 26, 2021

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

- Ubuntu 21.10

Summary:

Several security issues were fixed in libslirp.

Software Description:
- libslirp: General purpose TCP-IP emulator library

Details:

USN-5009-1 fixed vulnerabilities in libslirp. This update provides the
corresponding updates for Ubuntu 21.10.

Original advisory details:

 Qiuhao Li discovered that libslirp incorrectly handled certain header data
 lengths. An attacker inside a guest could possibly use this issue to leak
 sensitive information from the host. This issue only affected Ubuntu 20.04
 LTS and Ubuntu 20.10. (CVE-2020-29129, CVE-2020-29130)
  It was discovered that libslirp incorrectly handled certain udp packets. An
 attacker inside a guest could possibly use this issue to leak sensitive
 information from the host. (CVE-2021-3592, CVE-2021-3593, CVE-2021-3594,
 CVE-2021-3595)

Update instructions:

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

Ubuntu 21.10:
  libslirp0                       4.4.0-1ubuntu0.21.10.1

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5009-2
  https://ubuntu.com/security/notices/USN-5009-1
  CVE-2021-3592, CVE-2021-3593, CVE-2021-3594, CVE-2021-3595

Package Information:
  https://launchpad.net/ubuntu/+source/libslirp/4.4.0-1ubuntu0.21.10.1