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TITLE:
PCRE Multiple Vulnerabilities

SECUNIA ADVISORY ID:
SA27543

VERIFY ADVISORY:
http://secunia.com/advisories/27543/

CRITICAL:
Moderately critical

IMPACT:
Exposure of sensitive information, DoS, System access

WHERE:
>From remote

SOFTWARE:
PCRE 7.x
http://secunia.com/product/13118/
PCRE 6.x
http://secunia.com/product/5569/

DESCRIPTION:
Some vulnerabilities have been reported in PCRE, which can be
exploited by malicious people to cause a DoS (Denial of Service),
disclose sensitive information, or potentially compromise an
application using the library.

1) An error exists in the processing of "\Q\E" sequences with orphan
"\E" codes. This can be exploited to desynchronize the compiled
regular expression and execute corrupted bytecode. 

2) An error in the processing of multiple unspecified character
classes can be exploited to trigger an insufficient memory
allocation.

3) An error exists in the processing of multiple "\X?\d" and
"\P{L}?\d" patterns in non-UTF-8 mode. This can be exploited to crash
an affected process or to disclose restricted memory.

4) An error exists in multiple unspecified routines when searching
for unmatched brackets or parentheses. This can be exploited to crash
an affected application via a specially crafted string.  

5) Some integer overflow errors when processing escape sequences can
be exploited to crash an affected application or potentially cause
heap-based buffer overflows.

6) Some errors exist in the processing of "\P" and "\P{x}" sequences.
This can be exploited to cause heap-based buffer overflows or trigger
the execution of infinite loops.   

7) An error in the optimization of character classes containing a
lone unicode sequence can be exploited to cause a heap-based buffer
overflow.

The vulnerabilities are reported in versions prior to 7.3.

SOLUTION:
Update to version 7.3 or later.

PROVIDED AND/OR DISCOVERED BY:
Debian credits Tavis Ormandy, Google Security Team

ORIGINAL ADVISORY:
http://lists.debian.org/debian-security-announce/debian-security-announce-2007/msg00177.html

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