[USN-4938-1] Unbound vulnerabilities

Marc Deslauriers marc.deslauriers at canonical.com
Thu May 6 13:30:00 UTC 2021

Ubuntu Security Notice USN-4938-1
May 06, 2021

unbound vulnerabilities

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS


Several security issues were fixed in Unbound.

Software Description:
- unbound: validating, recursive, caching DNS resolver


It was discovered that Unbound contained multiple security issues. A
remote attacker could possibly use these issues to cause a denial of
service, inject arbitrary commands, execute arbitrary code, and overwrite
local files.

Update instructions:

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

Ubuntu 20.04 LTS:
  libunbound8                     1.9.4-2ubuntu1.2
  unbound                         1.9.4-2ubuntu1.2

Ubuntu 18.04 LTS:
  libunbound2                     1.6.7-1ubuntu2.4
  unbound                         1.6.7-1ubuntu2.4

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

  CVE-2019-25031, CVE-2019-25032, CVE-2019-25033, CVE-2019-25034,
  CVE-2019-25035, CVE-2019-25036, CVE-2019-25037, CVE-2019-25038,
  CVE-2019-25039, CVE-2019-25040, CVE-2019-25041, CVE-2019-25042,

Package Information:

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