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[Launchpad Bug Tracker <1881982@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package whoopsie - 0.2.69ubuntu0.1

---------------
whoopsie (0.2.69ubuntu0.1) focal-security; urgency=medium

  * SECURITY UPDATE: integer overflow in bson parsing (LP: #1872560)
    - lib/bson/*: updated to latest upstream release.
    - CVE-2020-12135
  * SECURITY UPDATE: resource exhaustion via memory leak (LP: #1881982)
    - src/whoopsie.c, src/tests/test_parse_report.c: properly handle
      GHashTable.
    - CVE-2020-11937
  * SECURITY UPDATE: DoS via large data length (LP: #1882180)
    - src/whoopsie.c, src/whoopsie.h, src/tests/test_parse_report.c: limit
      the size of a report file.
    - CVE-2020-15570

 -- Marc Deslauriers <marc.deslauriers@xxxxxxxxxx>  Fri, 24 Jul 2020
08:55:26 -0400

** Changed in: whoopsie (Ubuntu Focal)
       Status: Confirmed => Fix Released

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-12135

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2020-15570

** Changed in: whoopsie (Ubuntu Xenial)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1881982

Title:
  DoS vulnerability: cause resource exhaustion

Status in whoopsie package in Ubuntu:
  Confirmed
Status in whoopsie source package in Xenial:
  Fix Released
Status in whoopsie source package in Bionic:
  Fix Released
Status in whoopsie source package in Eoan:
  Confirmed
Status in whoopsie source package in Focal:
  Fix Released
Status in whoopsie source package in Groovy:
  Confirmed

Bug description:
  Hi,

  I have found a security issue on whoopsie 0.2.69 and earlier.

  # Vulnerability description
  The parse_report() function in whoopsie.c allows attackers to cause a denial of service (memory leak) via a crafted file. 
  Exploitation of this issue causes excessive memory consumption which results in the Linux kernel triggering OOM killer on arbitrary process.
  This results in the process being terminated by the OOM killer.

  
  # Details 
  We have found a memory leak vulnerability during the parsing the crash file, when a collision occurs on GHashTable through g_hash_table_insert().
  According to [1], if the key already exists in the GHashTable, its current value is replaced with the new value.
  If 'key_destory_func' and 'value_destroy_func' are supplied when creating the table, the old value and the passed key are freed using that function.
  Unfortunately, whoopsie does not handle the old value and the passed key when collision happens.
  If a crash file contains same repetitive key-value pairs, it leads to memory leak as much as the amount of repetition and results in denial-of-service.

  [1] https://developer.gnome.org/glib/stable/glib-Hash-Tables.html#g
  -hash-table-insert

  
  # PoC (*Please check the below PoC: whoopsie_killer.py)
  1) Generates a certain malformed crash file that contains same repetitive key-value pairs.
  2) Trigger the whoopsie to read the generated crash file.
  3) After then, the whoopsie process has been killed.

  
  # Mitigation (*Please check the below patch: g_hash_table_memory_leak.patch)
  We should use g_hash_table_new_full() with ‘key_destroy_func’ and ‘value_destroy_func’ functions instead of g_hash_table_new().
  Otherwise, before g_hash_table_insert(), we should check the collision via g_hash_table_lookup_extended() and obtain pointer to the old value and remove it.

  Sincerely,

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