Thunderbird ESR < 60.7.XXX - 'parser_get_next_char' Heap-Based Buffer Overflow

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• 作者： X41 D-Sec GmbH
  日期： 2019-06-17
• 类别：

  • dos
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/47003/

• X41 D-Sec GmbH Security Advisory: X41-2019-002
  
  Heap-based buffer overflow in Thunderbird
  =========================================
  Severity Rating: High
  Confirmed Affected Versions: All versions affected
  Confirmed Patched Versions: Thunderbird ESR 60.7.XXX
  Vendor: Thunderbird
  Vendor URL: https://www.thunderbird.net/
  Vendor Reference: https://bugzilla.mozilla.org/show_bug.cgi?id=1553820
  Vector: Incoming mail with calendar attachment
  Credit: X41 D-SEC GmbH, Luis Merino
  Status: Public
  CVE: CVE-2019-11703
  CWE: 122
  CVSS Score: 7.8
  CVSS Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O
  Advisory-URL: https://www.x41-dsec.de/lab/advisories/x41-2019-002-thunderbird
  
  Summary and Impact
  ==================
  A heap-based buffer overflow has been identified in the Thunderbird email
  client. The issue is present in the libical implementation, which was forked
  from upstream libical version 0.47.
  The issue can be triggered remotely, when an attacker sends an specially
  crafted calendar attachment and does not require user interaction. It
  might be used by a remote attacker to crash or gain remote code execution
  in the client system.
  This issue was initially reported by Brandon Perry here:
  https://bugzilla.mozilla.org/show_bug.cgi?id=1281041
  and fixed in libical upstream, but was never fixed in Thunderbird.
  X41 did not perform a full test or audit on the software.
  
  Product Description
  ===================
  Thunderbird is a free and open source email, newsfeed, chat, and calendaring
  client, that's easy to set up and customize.
  
  Analysis
  ========
  A heap-based buffer overflow in icalparser.c parser_get_next_char()
  can be triggered while parsing a calendar attachment containing a malformed
  or specially crafted string.
  The issue initially manifests with out of bounds read, but we don't discard
  it could later lead to out of bounds write.
  It is expected that an attacker can exploit this vulnerability to achieve
  remote code execution.
  
  Proof of Concept
  ================
  A reproducer ical file can be found in https://github.com/x41sec/advisories/tree/master/X41-2019-002
  
  Workarounds
  ===========
  A fix is available from upstream. Alternatively, libical can be replaced by icaljs,
  a JavaScript implementation of ical parsing, by setting 
  calendar.icaljs = true in Thunderbird configuration. 
  
  Timeline
  ========
  2016-06-20 Issue reported by Brandon Perry to the vendor
  2019-05-23 Issues reported to the vendor
  2019-05-23 Vendor reply
  2019-06-12 CVE IDs assigned
  2019-06-13 Patched Version released
  2019-06-13 Advisory released
  
  About X41 D-SEC GmbH
  ====================
  X41 is an expert provider for application security services.
  Having extensive industry experience and expertise in the area of information
  security, a strong core security team of world class security experts enables
  X41 to perform premium security services.
  Fields of expertise in the area of application security are security centered
  code reviews, binary reverse engineering and vulnerability discovery.
  Custom research and a IT security consulting and support services are core
  competencies of X41.
  
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/47003.zip