National Vulnerability Database

National Vulnerability Database

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    Vulnerabilities Detail

CVE-2006-0459 Detail

Current Description

flex.skl in Will Estes and John Millaway Fast Lexical Analyzer Generator (flex) before 2.5.33 does not allocate enough memory for grammars containing (1) REJECT statements or (2) trailing context rules, which causes flex to generate code that contains a buffer overflow that might allow context-dependent attackers to execute arbitrary code.

Source:  MITRE
Description Last Modified:  03/29/2006
View Analysis Description

Impact

CVSS v2.0 Severity and Metrics:

Base Score: 7.5 HIGH
Vector: (AV:N/AC:L/Au:N/C:P/I:P/A:P) (V2 legend)
Impact Subscore: 6.4
Exploitability Subscore: 10.0

Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): Partial
Integrity (I): Partial
Availability (A): Partial
Additional Information:
Provides user account access
Allows unauthorized disclosure of information
Allows disruption of service

Vendor Statements (disclaimer)

Official Statement from Red Hat (08/16/2006)

This issue only affects parsers which are generated by grammars which either use REJECT or rules with a variable trailing context (in these rules the parser has to keep all backtracking paths). The Red Hat Security Response Team analysed all packages that include flex generated parsers in Red Hat Enterprise Linux (2.1, 3, and 4) and found none were vulnerable.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?download
http://securityreason.com/securityalert/570
http://sourceforge.net/mailarchive/forum.php?thread_name=20060223020346.GA11231%40tabitha.home.tldz.org&forum_name=flex-announce
http://www.gentoo.org/security/en/glsa/glsa-200603-07.xml
http://www.securityfocus.com/bid/16896 Patch
http://www.us.debian.org/security/2006/dsa-1020 Patch Vendor Advisory
http://www.vupen.com/english/advisories/2006/0770
https://exchange.xforce.ibmcloud.com/vulnerabilities/24995
https://usn.ubuntu.com/260-1/

Technical Details

Vulnerability Type (View All)

Change History

3 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2006-0459
NVD Published Date:
03/29/2006
NVD Last Modified:
10/03/2018