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Category:   Application (Generic)  >   Dhcp Vendors:   ISC (Internet Software Consortium)
ISC DHCP Regular Expressions Bug Lets Remote Users Deny Service
SecurityTracker Alert ID:  1026393
SecurityTracker URL:
CVE Reference:   CVE-2011-4539   (Links to External Site)
Date:  Dec 8 2011
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.0.x, 4.1-ESV, 4.2.x
Description:   A vulnerability was reported in ISC DHCP. A remote user can cause denial of service conditions.

A remote user can send specially crafted DHCP Request packets to cause the target service to crash. DHCP servers configured to evaluate expressions using a regular expression (i.e., using the "~=" or "~~" comparison operators) may be affected.

BlueCat Networks reported this vulnerability.

Impact:   A remote user can cause the target service to crash.
Solution:   The vendor has issued a fix (4.1-ESV-R4, 4.2.3-P1).

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Not specified
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Dec 14 2011 (Red Hat Issues Fix) ISC DHCP Regular Expressions Bug Lets Remote Users Deny Service
Red Hat has issued a fix for Red Hat Enterprise Linux 6.

 Source Message Contents

[Original Message Not Available for Viewing]

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