Bug 920683 (CVE-2013-1841)

Summary: CVE-2013-1841 perl-Net-Server: Improper reverse DNS matching check for the given hostname
Product: [Other] Security Response Reporter: Jan Lieskovsky <jlieskov>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED UPSTREAM QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: carnil, kevin, perl-devel
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2019-06-10 11:00:18 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 920684, 920685    
Bug Blocks:    

Description Jan Lieskovsky 2013-03-12 14:32:44 UTC 
A security flaw was found in the way Net-Server, an extensible, class oriented module written in Perl language and intended to be the back end layer of Internet protocol servers, performed access control allow / deny decisions, when the 'reverse_lookups' option was enabled (previously the incoming connection source IP has been checked only for presence of reverse DNS matching record for the given hostname, but did not check that the hostname actually resolved back to the provided source IP address). A remote attacker could use this flaw to confuse Net-Server's parser into accepting an invalid reverse DNS entry for particular source IP address of the connection, possibly leading to incorrect ACL decision to be issued later.

References:
[1] http://www.openwall.com/lists/oss-security/2013/03/04/10
[2] http://www.openwall.com/lists/oss-security/2013/03/04/11
[3] http://www.openwall.com/lists/oss-security/2013/03/12/2
Comment 1 Jan Lieskovsky 2013-03-12 14:34:46 UTC 
I am not sure there is an upstream patch for this issue yet. But once there is, please schedule updates for Fedora / Fedora-EPEL versions.
Comment 2 Jan Lieskovsky 2013-03-12 14:36:11 UTC 
Created perl-Net-Server tracking bugs for this issue

Affects: fedora-all [bug 920684]
Affects: epel-all [bug 920685]
Comment 3 Product Security DevOps Team 2019-06-10 11:00:18 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.