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Bug 628582 - net-dns/dnsdist: crafted backend responses can cause a denial of service (CVE-2016-7069)
Summary: net-dns/dnsdist: crafted backend responses can cause a denial of service (CVE...
Status: RESOLVED DUPLICATE of bug 628534
Alias: None
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal normal
Assignee: Gentoo Security
URL: https://bugzilla.redhat.com/show_bug....
Whiteboard: ~3 [ebuild]
Keywords: PATCH
Depends on:
Blocks:
 
Reported: 2017-08-22 08:29 UTC by Aleksandr Wagner (Kivak)
Modified: 2017-08-22 09:21 UTC (History)
2 users (show)

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Package list:
Runtime testing required: ---

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Description Aleksandr Wagner (Kivak) 2017-08-22 08:29:37 UTC 
From $URL:

An issue has been found in dnsdist in the way EDNS0 OPT records are handled when parsing responses from a backend. When dnsdist is configured to add EDNS Client Subnet to a query, the response may contain an EDNS0 OPT record that has to be removed before forwarding the response to the initial client. On a 32-bit system, the pointer arithmetic used when parsing the received response to remove that record might trigger an undefined behavior leading to a crash.

dnsdist up to and including 1.1.0 is affected on 32-bit systems. dnsdist 1.2.0 is not affected, dnsdist on 64-bit systems is not affected.

Reference:

https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2017-01.html
Comment 1 Aleksandr Wagner (Kivak) 2017-08-22 08:38:53 UTC 

*** This bug has been marked as a duplicate of bug 628534 ***
Comment 2 Thomas Deutschmann (RETIRED) gentoo-dev 2017-08-22 09:21:57 UTC 
Freeing the alias.