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Home >> Browse Vulnerability Assessment Database >> Ubuntu Local Security Checks >> USN260-1 : flex vulnerability

Vulnerability Assessment Details

USN260-1 : flex vulnerability

Vulnerability Assessment Summary
flex vulnerability

Detailed Explanation for this Vulnerability Assessment

Summary :

These remote packages are missing security patches :
- cpp-3.3
- cpp-3.3-doc
- cpp-3.4
- cpp-3.4-doc
- fastjar
- fixincludes
- flex
- flex-doc
- g++-3.3
- g++-3.4
- g77-3.3
- g77-3.3-doc
- g77-3.4
- g77-3.4-doc
- gcc-3.3
- gcc-3.3-base
- gcc-3.3-doc
- gcc-3.4
- gcc-3.4-base
- gcc-3.4-doc
- gcj-3.3
- gcj-3.4
- gij-3.3
- gij-3.4
- gnat-3.3
- gnat-3.3-doc
- gnat-3.4
- gnat-3.4-doc
- gobjc-3.3
- gobjc-3.4
- gpc-2.1-3.3
- gpc-2.1-3.3-doc
- gpc-2.1-3.4
- gpc-2.1-3.4-doc
- lib32g
[...]

Description :

Chris Moore discovered a buffer overflow in a particular class of
lexicographical scanners generated by flex. This could be exploited to
execute arbitrary code by processing specially crafted user-defined
input to an application that uses a flex scanner for parsing.

This flaw particularly affects gpc, the GNU Pascal Compiler. A
potentially remote attacker could exploit this by tricking an user or
automated system into compiling a specially crafted Pascal source code
file.

Please note that gpc is not officially supported in Ubuntu (it is in
the 'universe' component of the archive). However, this affects you if
you use a customized version built from the gcc-3.3 or gcc-3.4 source
package (which is supported).

Solution :

Upgrade to :
- cpp-3.3-3.3.5-8ubuntu2.1 (Ubuntu 5.04)
- cpp-3.3-doc-3.3.5-8ubuntu2.1 (Ubuntu 5.04)
- cpp-3.4-3.4.4-6ubuntu8.1 (Ubuntu 5.10)
- cpp-3.4-doc-3.4.4-6ubuntu8.1 (Ubuntu 5.10)
- fastjar-3.4.2-2ubuntu1.1 (Ubuntu 4.10)
- fixincludes-3.3.4-9ubuntu5.1 (Ubuntu 4.10)
- flex-2.5.31-31ubuntu0.5.10.1 (Ubuntu 5.10)
- flex-doc-2.5.31-31ubuntu0.5.10.1 (Ubuntu 5.10)
- g++-3.3-3.3.5-8ubuntu2.1 (Ubuntu 5.04)
- g++-3.4-3.4.4-6ubuntu8.1 (Ubuntu 5.10)
- g77-3.3-3.3.5-8ubuntu2.1 (Ubuntu 5.04)
- g77-3.3-doc-3.3.5-8u
[...]

Network Security Threat Level: High

Networks Security ID:

Vulnerability Assessment Copyright: Ubuntu Security Notice (C) 2005 Canonical, Inc. / NASL script (C) 2005 Michel Arboi

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