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:
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 (at) gentoo (dot) org [email concealed] 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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If you have additional information or notice any errors regarding this security advisory, please use contact form or email us at info()securityreason()com.
Microsoft Device IO Control wrapped by the iphlpapi.dll API shipping with Windows Vista 32 bit and 64 bit contains a possibly exploitable, buffer overflow corrupting kernel memory.