Advanced Guestbook 2.4.2 allows remote attackers to obtain sensitive information via an invalid (1) GB_TBL parameter to (a) lang/codes-english.php or (b) image.php, which reveal the database name; (2) an invalid GB_DB parameter to index.php, coupled with a …/index lang cookie, which reveals the installation path; or (3) a direct request to index.php with no parameters or cookies, which reveals the installation path.
osvdb.org/34362
secunia.com/advisories/25153
securityreason.com/securityalert/2661
www.netvigilance.com/advisory0011
www.osvdb.org/33876
www.osvdb.org/33878
www.osvdb.org/33879
www.securityfocus.com/archive/1/467940/100/0/threaded
www.vupen.com/english/advisories/2007/1726
exchange.xforce.ibmcloud.com/vulnerabilities/34161