PCRE: Multiple vulnerabilities

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                         AUSCERT Security Bulletin

                               ASB-2010.0119
                     Buffer Overflow Corrected in PCRE
                                10 May 2010

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        AusCERT Security Bulletin Summary
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Product:              PCRE
Operating System:     UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Execute Arbitrary Code/Commands -- Remote with User Interaction
                      Denial of Service               -- Remote with User Interaction
Resolution:           Patch/Upgrade
Member content until: Wednesday, June  9 2010

OVERVIEW

        PCRE version 8.02 has been released correcting a security 
        vulnerability.


IMPACT

        The vendor has provided the following information regarding this
        vulnerability:
        
        "The checks for overrunning compiling workspace could trigger after 
        an overrun had occurred. This is a "should never occur" error, but 
        it can be triggered by pathological patterns such as hundreds of 
        nested parentheses. The checks now trigger 100 bytes before the end 
        of the workspace." [1]
        
        This vulnerability can reportedly be used to overflow the buffer
        which would lead to the execution of arbitrary code, or possibly a 
        Denial of Service (Dos) [2].


MITIGATION

        Version 8.02 is available for download from the vendor's website.[3]


REFERENCES

        [1] ChangeLog for PCRE
            http://www.pcre.org/changelog.txt

        [2] buffer overflow in pcre_compile.c
            http://bugs.exim.org/show_bug.cgi?id=962

        [3] PCRE - Perl Compatible Regular Expressions
            http://www.pcre.org/

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
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takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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