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TITLE:
TYPO3 "userUid" Command Execution Vulnerability

SECUNIA ADVISORY ID:
SA23446

VERIFY ADVISORY:
http://secunia.com/advisories/23446/

CRITICAL:
Highly critical

IMPACT:
System access

WHERE:
>From remote

SOFTWARE:
TYPO3 4.x
http://secunia.com/product/12113/

DESCRIPTION:
Daniel Fabian and J. Greil have reported a vulnerability in TYPO3,
which can be exploited by malicious people to gain system access.

Input passed to the "userUid" parameter in
sysext/rtehtmlarea/htmlarea/plugins/SpellChecker/spell-check-logic.php
is not properly sanitised before being used as one of the command line
arguments to the "aspell" command. This can be exploited to inject
arbitrary shell commands.

Successful exploitation requires that "safe_mode" is disabled.

NOTE: Another unspecified vulnerability in the same part of the code
has also been reported.

The vulnerability is reported in versions 4.0 to 4.0.3. Other
versions may also be affected.

SOLUTION:
Update to version 4.0.4.

PROVIDED AND/OR DISCOVERED BY:
Daniel Fabian and J. Greil from SEC CONSULT

ORIGINAL ADVISORY:
http://www.sec-consult.com/272.html

OTHER REFERENCES:
http://typo3.org/news-single-view/?tx_newsimporter_pi1%5BshowItem%5D=0&cHash=e4a40a11a9

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