faf6ea6f28
For several of these, we also patch previous releases. PiperOrigin-RevId: 346617124 Change-Id: I0e88fb02e1d7a98a1df3446c7251d3fcdfe3b8fc
2.2 KiB
TFSA-2020-032: Heap out of bounds read in filesystem glob matching
CVE Number
CVE-2020-26269
Impact
The general implementation for matching filesystem paths to globbing pattern is vulnerable to an access out of bounds of the array holding the directories:
if (!fs->Match(child_path, dirs[dir_index])) { ... }
Since dir_index is unconditionaly
incremented
outside of the lambda function where the vulnerable pattern occurs, this results
in an access out of bounds issue under certain scenarios. For example, if
/tmp/x is a directory that only contains a single file y, then the following
snippet will cause a crash due to the out of bounds read:
>>> tf.io.gfile.glob('/tmp/x/')
Segmentation fault
There are multiple invariants and preconditions that are assumed by the parallel
implementation of GetMatchingPaths but are not verified by the PRs introducing
it (#40861 and
#44310). Thus, we are
completely rewriting the implementation to fully specify and validate these.
Patches
We have patched the issue in GitHub commit 8b5b9dc96666a3a5d27fad7179ff215e3b74b67c and will release TensorFlow 2.4.0 containing the patch. TensorFlow nightly packages after this commit will also have the issue resolved.
This issue only impacts master branch and the release candidates for TF version 2.4. The final release of the 2.4 release will be patched.
For more information
Please consult our security guide for more information regarding the security model and how to contact us with issues and questions.
Attribution
This vulnerability has been reported by members of the Aivul Team from Qihoo 360.