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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.0220
                 USN-4699-1: Apache Log4net vulnerability
                              20 January 2021

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

Product:           log4net
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Modify Arbitrary Files   -- Remote/Unauthenticated
                   Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Remote/Unauthenticated
                   Reduced Security         -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-1285  

Reference:         ESB-2020.1753

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4699-1

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USN-4699-1: Apache Log4net vulnerability
19 January 2021

Apache Log4net could made to expose sensitive information if it
received a specially crafted configuration file.
Releases

  o Ubuntu 20.10
  o Ubuntu 20.04 LTS
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Packages

  o log4net - Highly configurable logging API for the CLI log4net

Details

It was discovered that Apache Log4net incorrectly handled certain configuration
files.
An attacker could possibly use this issue to expose sensitive information.

Update instructions

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

Ubuntu 20.10

  o liblog4net1.2-cil - 1.2.10+dfsg-7ubuntu0.20.10.1

Ubuntu 20.04

  o liblog4net1.2-cil - 1.2.10+dfsg-7ubuntu0.20.04.1

Ubuntu 18.04

  o liblog4net1.2-cil - 1.2.10+dfsg-7ubuntu0.18.04.1

Ubuntu 16.04

  o liblog4net1.2-cil - 1.2.10+dfsg-7ubuntu0.16.04.1

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

References

  o CVE-2018-1285

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