Hello All, We discovered multiple security issues in Google App Engine that allow for a complete Java VM security sandbox escape. There are more issues pending verification - we estimate them to be in the range of 30+ in total. Quick summary of our developments so far: - we bypassed GAE whitelisting of JRE classes / achieved complete Java VM security sandbox escape (17 full sandbox bypass PoC codes exploiting 22 issues in total), - we achieved native code execution (ability to issue arbitrary library / system calls), - we gained access to the files (binary / classes) comprising the JRE sandbox, that includes the monster libjavaruntime.so binary (468416808 bytes in total), - we extracted DWARF info from binary files (type information and such), - we extracted PROTOBUF definitions from Java classes (description of 57 services in 542 .proto files), - we extracted PROTOBUF definition from binary files (description of 8 services in 68 .proto files), - we analyzed the above stuff and learned a lot about the GAE environment for Java sandbox (among others). Unfortunately, we cannot complete our work due to the suspension of the "test" GAE account that took place today. Without any doubt this is an opsec failure on our end (this week we did poke a little bit more aggressively around the underlying OS sandbox / issued various system calls in order to learn more about the nature of the error code 202, the sandbox itself, etc.). Taking into account an educational nature of the security issues found in GAE Java security sandbox and what seems to be an appreciation Google has for arbitrary security research / all sorts of sandbox escapes [1], we hope the company makes it possible for us to complete our work and reenables our GAE account, so that we could in particular: - verify the remaining potential vulnerabilities spotted, - verify some attack ideas, - prepare short report containing the description of the issues found (the results of the evaluation) and deliver it to Google (in a form similar to SE-2013-01 project report [2]), - share the results of our research with the security community. Thank you. Best Regards, Adam Gowdiak --------------------------------------------- Security Explorations http://www.security-explorations.com "We bring security research to the new level" --------------------------------------------- References: [1] Google Security Research http://code.google.com/p/google-security-research/ [2] Security vulnerabilities in Oracle Java Cloud Service http://www.security-explorations.com/en/SE-2013-01.html