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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.2595
                      USN-4436-2: librsvg regression
                               30 July 2020

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

Product:           librsvg
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Denial of Service -- Remote with User Interaction
                   Reduced Security  -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-20446 CVE-2017-11464 

Reference:         ESB-2020.2523

Original Bulletin: 
   https://usn.ubuntu.com/4436-2/

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USN-4436-2: librsvg regression
29 July 2020

USN-4436-1 introduced a regression in librsvg.
Releases

  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS

Packages

  o librsvg - renderer library for SVG files

Details

USN-4436-1 fixed a vulnerability in librsvg. The upstream fix caused a
regression when parsing certain SVG files. This update backs out the fix
pending further investigation.

Original advisory details:

It was discovered that librsvg incorrectly handled parsing certain SVG
files. A remote attacker could possibly use this issue to cause librsvg to
crash, resulting in a denial of service. This issue only affected Ubuntu
16.04 LTS. (CVE-2017-11464)

It was discovered that librsvg incorrectly handled parsing certain SVG
files with nested patterns. A remote attacker could possibly use this issue
to cause librsvg to consume resources and crash, resulting in a denial of
service. (CVE-2019-20446)

Update instructions

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

Ubuntu 18.04

  o librsvg2-2 - 2.40.20-2ubuntu0.2

Ubuntu 16.04

  o librsvg2-2 - 2.40.13-3ubuntu0.2

After a standard system update you need to restart your session to make all
the necessary changes.

References

  o https://launchpad.net/bugs/1889206

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