A Crash in CFX_UnownedPtr::Probe() is low-severity, since it means that a class was deleted containing a dangling pointer. Hence it is possible that some other path might exist to use the freed memory, but it isn't directly exploitable until that path is found to exist.

XFA => not shipping.

https://pdfium-review.googlesource.com/5730 is the CL.

Next pdfium roll should bring closure.

ClusterFuzz has detected this issue as fixed in range 473337:473390.

Detailed report: https://clusterfuzz.com/testcase?key=5266232378130432

Fuzzer: libfuzzer_pdfium_xfa_fuzzer
Job Type: libfuzzer_chrome_asan_debug
Platform Id: linux

Crash Type: Heap-buffer-overflow READ 1
Crash Address: 0x6020000017c0
Crash State:
  CFX_UnownedPtr<unsigned int const>::Probe
  CFX_UnownedPtr<unsigned int const>::~CFX_UnownedPtr
  CFX_StringCTemplate<wchar_t>::~CFX_StringCTemplate
  
Sanitizer: address (ASAN)

Recommended Security Severity: Medium

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=472979:473031
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=473337:473390

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5266232378130432


See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reproducing.md for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

This bug has been closed for more than 14 weeks. Removing security view restrictions.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot