NULL Pointer Dereference

mruby is vulnerable to NULL pointer dereference. The vulnerability exists in preparesingletonclass function of class.c because the object has not been checked before calling the method which leads to an application crash...

in mruby/mruby

Description There is a NULL Pointer Dereference in preparesingletonclass src/class.c:360:13. This bug has been found on mruby lastest commit hash 171d32c0071d776207174a40a8fa26def3dbb931 on Ubuntu 20.04 for x8664/amd64. Proof of Concept 1.timesb= a=0 0,m:0 c=0=0,nil=nil0 def mend def c.eend Steps...