National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

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      Last Modified:  03/29/2006      View Analysis Description

Quick Info

CVE Dictionary Entry:
CVE-2006-0459
Original release date:
03/29/2006
Last revised:
07/19/2017
Source:
US-CERT/NIST

Impact

CVSS Severity (version 2.0):
CVSS v2 Base Score:
7.5 HIGH
Vector:
(AV:N/AC:L/Au:N/C:P/I:P/A:P) (legend)
Impact Subscore:
6.4
Exploitability Subscore:
10.0
CVSS Version 2 Metrics:
Access Vector:
Network exploitable
Access Complexity:
Low
Authentication:
Not required to exploit
Impact Type:
Provides user account access, Allows partial confidentiality, integrity, and availability violation; 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 Type Source Name
http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?download External Source CONFIRM http://prdownloads.sourceforge.net/flex/flex-2.5.33.tar.bz2?download
http://securityreason.com/securityalert/570 External Source SREASON 570
http://sourceforge.net/mailarchive/forum.php?thread_name=20060223020346.GA11231%40tabitha.home.tldz.org&forum_name=flex-announce External Source MLIST [flex-announce] 20060222 flex 2.5.33 released
http://www.gentoo.org/security/en/glsa/glsa-200603-07.xml External Source GENTOO GLSA-200603-07
http://www.securityfocus.com/bid/16896 Patch External Source BID 16896
http://www.ubuntulinux.org/support/documentation/usn/usn-260-1 External Source UBUNTU USN-260-1
http://www.us.debian.org/security/2006/dsa-1020 Patch; Vendor Advisory External Source DEBIAN DSA-1020
http://www.vupen.com/english/advisories/2006/0770 External Source VUPEN ADV-2006-0770
https://exchange.xforce.ibmcloud.com/vulnerabilities/24995 External Source XF flex-bypass-security(24995)

Technical Details

Vulnerability Type (View All)

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