Bug 928011 - (CVE-2013-2494) CVE-2013-2494 dhcp: bind/libdns CVE-2013-2266 regular expressions excessive resource consumption DoS
CVE-2013-2494 dhcp: bind/libdns CVE-2013-2266 regular expressions excessive r...
Status: CLOSED DUPLICATE of bug 928027
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Reopened, Security
Depends On:
Blocks: 928048
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Reported: 2013-03-26 13:03 EDT by Jan Lieskovsky
Modified: 2013-03-27 06:37 EDT (History)
3 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2013-03-27 06:36:35 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Jan Lieskovsky 2013-03-26 13:03:56 EDT
A denial of service flaw was found in the way libdns library implementation of BIND processed certain requests. A DHCP client could issue a specially-crafted DHCP protocol request that, when processed would lead to excessive memory consumption (memory exhaustion) at the side of the DHCP server process, possibly leading to its crash.

[1] https://kb.isc.org/article/AA-00880
[2] ftp://ftp.isc.org/isc/dhcp/4.2.5-P1/dhcp-4.2.5-P1-RELNOTES
Comment 6 Tomas Hoger 2013-03-26 15:31:53 EDT
Release notes indicate:

- A security issue in Bind9 was found and fixed.  This release includes the
  fixed Bind9 code.  There have been no code changes to the DHCP code.
  [ISC-Bugs #32688]
  CVE: CVE-2013-2266

DHCP update upgrades used Bind version to fix CVE-2013-2266 (bug 928027).  There should be no separate CVE id assigned for DHCP just because it's different application that uses/embeds vulnerable Bind code.
Comment 7 Tomas Hoger 2013-03-26 15:46:40 EDT
Fedora dhcp builds remove embed bind source and link against system libdns:

Comment 12 Huzaifa S. Sidhpurwala 2013-03-27 06:36:13 EDT

Not Vulnerable. This issue does not affect the version of dhcp as shipped with Red Hat Enterprise Linux 5 and 6.
Comment 13 Huzaifa S. Sidhpurwala 2013-03-27 06:36:35 EDT

*** This bug has been marked as a duplicate of bug 928027 ***
Comment 14 Huzaifa S. Sidhpurwala 2013-03-27 06:37:36 EDT
This issue does not affect the version of dhcp as shipped with Fedora 17 and Fedora 18. More details in comment #7

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