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Bug 605584 (CVE-2016-7073, CVE-2016-7074) - [TRACKER] Insufficient validation of TSIG signatures (CVE-2016-{7073,7074})
Summary: [TRACKER] Insufficient validation of TSIG signatures (CVE-2016-{7073,7074})
Status: RESOLVED FIXED
Alias: CVE-2016-7073, CVE-2016-7074
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Security
URL: https://doc.powerdns.com/md/security/...
Whiteboard:
Keywords: Tracker
Depends on: CVE-2016-2120, CVE-2016-7072 605590
Blocks:
  Show dependency tree
 
Reported: 2017-01-13 15:20 UTC by Thomas Deutschmann
Modified: 2017-01-23 03:56 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---


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Description Thomas Deutschmann gentoo-dev Security 2017-01-13 15:20:44 UTC
From $URL:

PowerDNS Security Advisory 2016-04: Insufficient validation of TSIG signatures

  • CVE: CVE-2016-7073 CVE-2016-7074
  • Date: December 15th 2016
  • Credit: Mongo
  • Affects: PowerDNS Authoritative Server up to and including 3.4.10,
             4.0.1, PowerDNS Recursor from 4.0.0 and up to and including
             4.0.3
  • Not affected: PowerDNS Authoritative Server 3.4.11, 4.0.2, PowerDNS
                  Recursor < 4.0.0, 4.0.4
  • Severity: Medium
  • Impact: Zone content alteration
  • Exploit: This problem can be triggered by an attacker in position of
             man-in-the-middle
  • Risk of system compromise: No
  • Solution: Upgrade to a non-affected version

Two issues have been found in PowerDNS Authoritative Server allowing an
attacker in position of man-in-the-middle to alter the content of an AXFR
because of insufficient validation of TSIG signatures. The first issue is
a missing check of the TSIG time and fudge values in AXFRRetriever,
leading to a possible replay attack. This issue has been assigned
CVE-2016-7073. The second issue is a missing check that the TSIG record
is the last one, leading to the possibility of parsing records that are
not covered by the TSIG signature. This issue has been assigned
CVE-2016-7074.

PowerDNS Authoritative Server up to and including 3.4.10 and 4.0.1 are
affected. PowerDNS Recursor from 4.0.0 up to and including 4.0.3 are
affected.

For those unable to upgrade to a new version, a minimal patch is
available: https://downloads.powerdns.com/patches/2016-04

We would like to thank Mongo for finding and subsequently reporting this
issue.