> Silvio Cesare discovered a potential information leak in glibc. It > allows LD_DEBUG on SUID binaries where it should not be allowed. This > has various security implications, which may be used to gain > confidentional information. It's worse than that. You can essentially single-step through the library calls of a binary by turning on verbose debugging through LD_DEBUG and then carefully controlling stdout so that the program blocks while writing the debugging output. I've used this to exploit race conditions in setuid binaries that would otherwise be nearly impossible to trigger. Gentoo's method of adding LD_DEBUG to UNSECURE_ENVVARS will prevent this. -jim
