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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3277
                   USN-5102-1: Mercurial vulnerabilities
                              5 October 2021

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

Product:           Mercurial
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Create Arbitrary Files   -- Remote/Unauthenticated
                   Denial of Service        -- Remote/Unauthenticated
                   Access Confidential Data -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-3902 CVE-2018-17983 

Reference:         ESB-2020.3673
                   ESB-2019.1424
                   ESB-2018.3292

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-5102-1

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USN-5102-1: Mercurial vulnerabilities
04 October 2021

Several security issues were fixed in Mercurial.
Releases

  o Ubuntu 18.04 LTS

Packages

  o mercurial - easy-to-use, scalable distributed version control system

Details

It was discovered that Mercurial mishandled symlinks in subrepositories. An
attacker could use this issue to write arbitrary files to the
target's filesystem. ( CVE-2019-3902 )

It was discovered that Mercurial incorrectly handled certain manifest files.
An attacker could use this issue to cause a denial of service and possibly
execute arbitrary code. ( CVE-2018-17983 )

Update instructions

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

Ubuntu 18.04

  o mercurial - 4.5.3-1ubuntu2.2
  o mercurial-common - 4.5.3-1ubuntu2.2

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

References

  o CVE-2019-3902
  o CVE-2018-17983

Related notices

  o USN-4086-1 : mercurial-common, mercurial

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