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Issue 724640 link

Starred by 1 user
Status: Fixed
Owner:
tsepez@chromium.org
Closed: May 2017
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: ----
Type: Bug-Security



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Heap-use-after-free in Probe

Project Member Reported by ClusterFuzz, May 19 2017 
Detailed report: https://clusterfuzz.com/testcase?key=5896886920937472

Fuzzer: afl_pdfium_xfa_fuzzer
Job Type: afl_chrome_asan
Platform Id: linux

Crash Type: Heap-use-after-free READ 1
Crash Address: 0x60c0001cf4c0
Crash State:
  Probe
  ~CFX_UnownedPtr
  CFGAS_GEFont::~CFGAS_GEFont
  
Sanitizer: address (ASAN)

Recommended Security Severity: High

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5896886920937472


Issue manually filed by: tsepez

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

Comment 1 by tsepez@chromium.org, May 19 2017

Labels: -Security_Severity-High Security_Impact-None Security_Severity-Low
Owner: tsepez@chromium.org
Status: Assigned (was: Untriaged)
XFA => not shipping.

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

Comment 2 by tsepez@chromium.org, May 25 2017

Status: Fixed (was: Assigned)
Hasn't reprod for a few days, given other fixes, closing.
Project Member

Comment 3 by sheriffbot@chromium.org, May 26 2017

Labels: -Restrict-View-SecurityTeam Restrict-View-SecurityNotify
Project Member

Comment 4 by sheriffbot@chromium.org, Sep 1 2017

Labels: -Restrict-View-SecurityNotify allpublic
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
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