Several local vulnerabilities have been discovered in libicu, International Components for Unicode, The Common Vulnerabilities and Exposures project identifies the following problems:
libicu in International Components for Unicode (ICU) 3.8.1 and earlier attempts to process backreferences to the nonexistent capture group zero (aka \0), which might allow context-dependent attackers to read from, or write to, out-of-bounds memory locations, related to corruption of REStackFrames.
Heap-based buffer overflow in the doInterval function in regexcmp.cpp in libicu in International Components for Unicode (ICU) 3.8.1 and earlier allows context-dependent attackers to cause a denial of service (memory consumption) and possibly have unspecified other impact via a regular expression that writes a large amount of data to the backtracking stack.
For the stable distribution (etch), these problems have been fixed in version 3.6-2etch1.
For the unstable distribution (sid), these problems have been fixed in version 3.8-6.
We recommend that you upgrade your libicu package.
MD5 checksums of the listed files are available in the original advisory.