CVE-2021-29591
TFlite graphs must not have loops between nodes. However, this condition was not checked and an attacker could craft models that would result in infinite loop during evaluation. In certain cases, the infinite loop would be replaced by stack overflow due to too many recursive calls.
For example, the While
implementation
could be tricked into a scneario where both the body and the loop subgraphs are
the same. Evaluating one of the subgraphs means calling the Eval
function for
the other and this quickly exhaust all stack space.
We have patched the issue in GitHub commit
9c1dc920d8ffb4893d6c9d27d1f039607b326743
(for the While
operator) and in GitHub commit
c6173f5fe66cdbab74f4f869311fe6aae2ba35f4
(in general).
The fix will be included in TensorFlow 2.5.0. We will also cherrypick this commit on TensorFlow 2.4.2, TensorFlow 2.3.3, TensorFlow 2.2.3 and TensorFlow 2.1.4, as these are also affected and still in supported range.
Please consult our security guide for more information regarding the security model and how to contact us with issues and questions.
This vulnerability has been reported by members of the Aivul Team from Qihoo 360.