A cross-site scripting vulnerability exists in the start_form() function in CGI.pm. This function outputs user-controlled data into the action attribute of a form element without sanitizing it, allowing a remote user to execute arbitrary web script within the context of the generated page. Any program which uses this function in the CGI.pm module may be affected.
For the current stable distribution (woody) this problem has been fixed in version 5.6.1-8.3.
For the unstable distribution (sid) this problem has been fixed in version 5.8.0-19.
We recommend that you update your perl package.
MD5 checksums of the listed files are available in the original advisory.