Bug 1849779 (CVE-2017-9109)

Summary: CVE-2017-9109 adns: out-of-bounds access when handling apparent answers
Product: [Other] Security Response Reporter: Guilherme de Almeida Suckevicz <gsuckevi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rvokal, sergio, thozza, vonsch
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Last Closed: 2020-06-22 23:20:37 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 1849780    
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Description Guilherme de Almeida Suckevicz 2020-06-22 19:29:29 UTC 
An issue was discovered in adns before 1.5.2. It fails to ignore apparent answers before the first RR that was found the first time. when this is fixed, the second answer scan finds the same RRs at the first. Otherwise, adns can be confused by interleaving answers for the CNAME target, with the CNAME itself. In that case the answer data structure (on the heap) can be overrun. With this fixed, it prefers to look only at the answer RRs which come after the CNAME, which is at least arguably correct.

Reference:
https://www.chiark.greenend.org.uk/pipermail/adns-announce/2020/000004.html
Comment 1 Guilherme de Almeida Suckevicz 2020-06-22 19:29:46 UTC 
Created adns tracking bugs for this issue:

Affects: fedora-all [bug 1849780]
Comment 2 Product Security DevOps Team 2020-06-22 23:20:37 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.