A vulnerability was discovered and corrected in krb5-appl:

ftpd.c in the GSS-API FTP daemon in MIT Kerberos Version 5 Applications
(aka krb5-appl) 1.0.1 and earlier does not check the krb5_setegid
return value, which allows remote authenticated users to bypass
intended group access restrictions, and create, overwrite, delete,
or read files, via standard FTP commands, related to missing autoconf
tests in a configure script (CVE-2011-1526).

The updated packages have been patched to correct this issue.