Tavis Ormandy and Will Drewry have reported a vulnerability in Perl, which potentially can be exploited by malicious people to compromise a vulnerable system.
The vulnerability is caused due to a boundary error within the processing of regular expressions containing Unicode data. This can be exploited to cause a buffer overflow via a specially crafted regular expression causing a runtime switch to the Unicode character scheme.
The vulnerability is reported in version 5.8.8. Other versions may also be affected.
NOTE: An additional potential vulnerability related to the processing of Unicode characters in regular expressions has also been reported.
Solution: Fixed in development version 5.9.5.
Provided and/or discovered by: Red Hat credits Tavis Ormandy and Will Drewry, Google Security Team
Original Advisory: https://bugzilla.redhat.com/show_bug.cgi?id=323571
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Subject: Perl Regular Expressions Unicode Data Buffer Overflow
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