Flex lexicographical scanner class buffer overflow
| flex-lexicographical-scanner-bo (24995) |  High Risk |
Description:
Fast Lexical Analyzer (Flex) is vulnerable to a buffer overflow in a particular class of lexicographical scanners. A remote attacker could exploit this vulnerability to execute arbitrary commands on the system.
Platforms Affected:
- Canonical, Ubuntu 4.10
- Canonical, Ubuntu 5.04
- Canonical, Ubuntu 5.10
- Debian, Debian Linux 3.1
- Flex, Flex prior to 2.5.33
- Gentoo, Linux
Remedy:
Upgrade to the latest version of Flex (2.5.33 or later), available from the Flex Web site. See References.
For Debian GNU/Linux:
Refer to DSA-1020-1 for patch, upgrade, or suggested workaround information. See References.
For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 2006-03-07 for patch, upgrade, or suggested workaround information. See References.
For Ubuntu Linux:
Refer to USN-260-1 for patch, upgrade, or suggested workaround information. See References.
For other distributions:
Contact your vendor for patch or upgrade information.
Consequences:
Gain Access
References:
- Flex Web site, flex: The Fast Lexical Analyzer at http://flex.sourceforge.net/.
- flex-announce Mailing List, 2006-02-22 18:09, flex 2.5.33 released at http://sourceforge.net/mailarchive/message.php?msg_id=14895090.
- BID-16896: Flex Code Generation Buffer Overflow Vulnerability
- CVE-2006-0459: 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.
- CVE-2006-0975: ** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: CVE-2006-0459. Reason: This candidate is a reservation duplicate of CVE-2006-0459. Notes: All CVE users should reference CVE-2006-0459 instead of this candidate. All references and descriptions in this candidate have been removed to prevent accidental usage.
- DSA-1020: flex -- buffer overflow
- GLSA-200603-07: flex: Potential insecure code generation
- OSVDB ID: 23440: Fast Lexical Analyzer Generator (Flex) Multiple Lexicographical Scanners Overflow
- SA19071: Flex Generated C Parsers Buffer Overflow Vulnerability
- USN-260-1: flex vulnerability
- VUPEN/ADV-2006-0770: Fast Lexical Analyzer (Flex) Scanners Buffer Overflow Vulnerability
Reported:
Mar 01, 2006
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