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Ubuntu Security Notice USN-4436-2
July 29, 2020

librsvg regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

USN-4436-1 introduced a regression in librsvg.

Software Description:
- 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 LTS:
  librsvg2-2                      2.40.20-2ubuntu0.2

Ubuntu 16.04 LTS:
  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:
  https://usn.ubuntu.com/4436-2
  https://usn.ubuntu.com/4436-1
  https://launchpad.net/bugs/1889206

Package Information:
  https://launchpad.net/ubuntu/+source/librsvg/2.40.20-2ubuntu0.2
  https://launchpad.net/ubuntu/+source/librsvg/2.40.13-3ubuntu0.2