- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200603-07 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: flex: Potential insecure code generation Date: March 10, 2006 Bugs: #122940 ID: 200603-07 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== flex might generate code with a buffer overflow, making applications using such scanners vulnerable to the execution of arbitrary code. Background ========== flex is a programming tool used to generate scanners (programs which recognize lexical patterns in text). Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 sys-devel/flex < 2.5.33-r1 >= 2.5.33-r1 Description =========== Chris Moore discovered a buffer overflow in a special class of lexicographical scanners generated by flex. Only scanners generated by grammars which use either REJECT, or rules with a "variable trailing context" might be at risk. Impact ====== An attacker could feed malicious input to an application making use of an affected scanner and trigger the buffer overflow, potentially resulting in the execution of arbitrary code. Workaround ========== Avoid using vulnerable grammar in your flex scanners. Resolution ========== All flex users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=sys-devel/flex-2.5.33-r1" References ========== [ 1 ] CVE-2006-0459 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0459 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200603-07.xml Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@xxxxxxxxxx or alternatively, you may file a bug at http://bugs.gentoo.org. License ======= Copyright 2006 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. http://creativecommons.org/licenses/by-sa/2.0
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