file:magic_fuzzer: Index-out-of-bounds in der_tag

2020-02-17T07:31:52
ID OSSFUZZ-20753
Type ossfuzz
Reporter Google
Modified 2020-03-19T18:57:47

Description

Project: https://github.com/file/file.git

Detailed Report: https://oss-fuzz.com/testcase?key=5642732083347456

Project: file Fuzzing Engine: libFuzzer Fuzz Target: magic_fuzzer Job Type: libfuzzer_ubsan_file Platform Id: linux

Crash Type: Index-out-of-bounds Crash Address: Crash State: der_tag der_cmp magiccheck

Sanitizer: undefined (UBSAN)

Recommended Security Severity: Medium

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_ubsan_file&range=202002160309:202002170309

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5642732083347456

Issue filed automatically.

See https://google.github.io/oss-fuzz/advanced-topics/reproducing for instructions to reproduce this bug locally. When you fix this bug, please * mention the fix revision(s). * state whether the bug was a short-lived regression or an old bug in any stable releases. * add any other useful information. This information can help downstream consumers.

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This bug is subject to a 90 day disclosure deadline. If 90 days elapse without an upstream patch, then the bug report will automatically become visible to the public.