GLSA Advocate
Joined: 12 May 2004 Posts: 2663
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Posted: Fri Mar 10, 2006 9:26 pm Post subject: [ GLSA 200603-07 ] flex: Potential insecure code generation |
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Gentoo Linux Security Advisory
Title: flex: Potential insecure code generation (GLSA 200603-07)
Severity: normal
Exploitable: remote and local
Date: March 10, 2006
Bug(s): #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: sys-devel/flex
Vulnerable: < 2.5.33-r1
Unaffected: >= 2.5.33-r1
Architectures: All supported architectures
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:
Code: | # emerge --sync
# emerge --ask --oneshot --verbose ">=sys-devel/flex-2.5.33-r1" |
References
CVE-2006-0459
Last edited by GLSA on Mon Jan 20, 2014 8:25 am; edited 5 times in total |
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