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             AUSCERT External Security Bulletin Redistribution

                               ESB-2022.5203
                    USN-5690-1: libXdmcp vulnerability
                              20 October 2022

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           libXdmcp
Publisher:         Ubuntu
Operating System:  Ubuntu
Resolution:        Patch/Upgrade
CVE Names:         CVE-2017-2625  

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5690-1

Comment: CVSS (Max):  5.5 CVE-2017-2625 (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
         CVSS Source: NVD
         Calculator:  https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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USN-5690-1: libXdmcp vulnerability
19 October 2022

libXdmcp could be made to expose sensitive information.
Releases

  o Ubuntu 16.04 ESM
  o Ubuntu 14.04 ESM

Packages

  o libxdmcp - X11 authorisation library (development headers)

Details

It was discovered that libXdmcp was generating weak session keys.
A local attacker could possibly use this issue to perform a brute
force attack and obtain another user's key.

Update instructions

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

Ubuntu 16.04

  o libxdmcp6 - 1:1.1.2-1.1ubuntu0.1~esm1
    Available with Ubuntu Pro (Infra-only)

Ubuntu 14.04

  o libxdmcp6 - 1:1.1.1-1ubuntu0.1~esm1
    Available with Ubuntu Pro (Infra-only)

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

References

  o CVE-2017-2625

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