Bug 920683 (CVE-2013-1841) - CVE-2013-1841 perl-Net-Server: Improper reverse DNS matching check for the given hostname
Summary: CVE-2013-1841 perl-Net-Server: Improper reverse DNS matching check for the gi...
Alias: CVE-2013-1841
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 920684 920685
TreeView+ depends on / blocked
Reported: 2013-03-12 14:32 UTC by Jan Lieskovsky
Modified: 2019-09-29 13:01 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2019-06-10 11:00:18 UTC

Attachments (Terms of Use)

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.

[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.

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