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International Components for Unicode Regular Expressions Vulnerabilities
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Secunia Advisory:
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SA28575
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Release Date:
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2008-01-25
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Last Update:
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2008-07-03
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Popularity:
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6,702 views
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Critical:
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Moderately critical
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Impact:
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DoS
System access
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Where:
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From remote
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Solution Status:
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Vendor Workaround
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| Software: | International Components for Unicode (ICU) 3.x
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Subscribe:
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| CVE reference: | CVE-2007-4770
CVE-2007-4771
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Description:
Will Drewry has reported some vulnerabilities in International Components for Unicode, which can be exploited by malicious people to cause a DoS (Denial of Service) or potentially compromise an application using the library.
1) A regular expression containing a back reference to capture group zero (\0) may reference random memory areas, which can be exploited to crash an application using the library.
2) The library does not limit the size of the backtracking stack. This can be exploited to cause a heap-based buffer overflow via certain specially crafted regular expressions.
The vulnerabilities are reported in version 3.8.1. Prior versions may also be affected.
Solution:
Apply vendor patch.
http://bugs.icu-project.org/trac/changeset/23292?format=3Ddiff
The vulnerabilities are also fixed in version 4.0.
Provided and/or discovered by:
Will Drewry
Changelog:
2008-07-03: Updated "Solution" section.
Original Advisory:
http://sourceforge.net/mailarchive/me...e42xb4a4aaf0fcccecbd%40mail.gmail.com
Other References:
https://bugzilla.redhat.com/show_bug.cgi?id=429023
https://bugzilla.redhat.com/show_bug.cgi?id=429025
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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