Joined: 12 May 2004
|Posted: Fri Mar 10, 2006 9:26 pm Post subject: [ GLSA 200603-07 ] flex: Potential insecure code generation
|Gentoo Linux Security Advisory
Title: flex: Potential insecure code generation (GLSA 200603-07)
Exploitable: remote and local
Date: March 10, 2006
flex might generate code with a buffer overflow, making applications using
such scanners vulnerable to the execution of arbitrary code.
flex is a programming tool used to generate scanners (programs
which recognize lexical patterns in text).
Vulnerable: < 2.5.33-r1
Unaffected: >= 2.5.33-r1
Architectures: All supported architectures
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.
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.
Avoid using vulnerable grammar in your flex scanners.
All flex users should upgrade to the latest version:
|# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-devel/flex-2.5.33-r1"
Last edited by GLSA on Mon Jan 20, 2014 8:25 am; edited 5 times in total