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[ GLSA 200603-07 ] flex: Potential insecure code generation
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GLSA
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PostPosted: Fri Mar 10, 2006 9:26 pm    Post subject: [ GLSA 200603-07 ] flex: Potential insecure code generation Reply with quote

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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