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USN-591-1: libicu vulnerabilities

24 March 2008

libicu vulnerabilities

Releases

Packages

Details

Will Drewry discovered that libicu did not properly handle '\0' when
processing regular expressions. If an application linked against libicu
processed a crafted regular expression, an attacker could execute
arbitrary code with privileges of the user invoking the program.
(CVE-2007-4770)

Will Drewry discovered that libicu did not properly limit its
backtracking stack size. If an application linked against libicu
processed a crafted regular expression, an attacker could cause a denial
of service via resource exhaustion. (CVE-2007-4771)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 7.10
Ubuntu 7.04
Ubuntu 6.10
Ubuntu 6.06

After a standard system upgrade you need to restart applications linked
against libicu, such as OpenOffice.org, to effect the necessary changes.