Bug 1215747 (CVE-2015-3294)

Summary: CVE-2015-3294 dnsmasq: unchecked return value of the setup_reply() function
Product: [Other] Security Response Reporter: Martin Prpič <mprpic>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: abaron, aortega, apevec, ayoung, carnil, chrisw, dallan, gkotton, itamar, laine, lhh, lpeer, markmc, phracek, psimerda, rbryant, sclewis, thozza, veillard, yeylon
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: dnsmasq 2.73rc4 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-05-28 08:44:00 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1215748    

Description Martin Prpič 2015-04-27 16:16:26 UTC 
The following flaw was found in dnsmasq:

Dnsmasq does not properly check the return value of the setup_reply() function called during a tcp connection (by the tcp_request() function). This return value is then used as a size argument in a function which writes data on the client's connection. This may lead, upon successful exploitation, to reading the heap memory of dnsmasq.

This issue is fixed in dnsmasq-2.73rc4:

http://www.thekelleys.org.uk/dnsmasq/release-candidates/

External References:

https://www.obrela.com/home/security-labs/advisories/osi-advisory-osi-1502/