Mozilla Firefox, Thunderbird, and SeaMonkey nsPlaintextEditor::FireClipboardEvent() code excution

firefox-fireclipboard-code-exec (80188) The risk level is classified as HighHigh Risk


Mozilla Firefox, Thunderbird, and SeaMonkey could allow a remote attacker to execute arbitrary code on the system, caused by a use-after-free error in the nsPlaintextEditor::FireClipboardEvent() function. By persuading a victim to visit a specially-crafted Web site, a remote attacker could exploit this vulnerability to execute arbitrary code on the vulnerable system or cause a denial of service.


Base Score: 9.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Complete
  Integrity Impact: Complete
  Availability Impact: Complete
Temporal Score: 6.9
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed


Gain Access


Refer to MFSA 2012-105 for patch, upgrade or suggested workaround information. See References.


  • MFSA 2012-105: Use-after-free and buffer overflow issues found using Address Sanitizer.
  • BID-56633: Mozilla Firefox/Thunderbird/SeaMonkey CVE-2012-4215 Use After Free Memory Corruption Vulnerability
  • CVE-2012-4215: Use-after-free vulnerability in the nsPlaintextEditor::FireClipboardEvent function in Mozilla Firefox before 17.0, Firefox ESR 10.x before 10.0.11, Thunderbird before 17.0, Thunderbird ESR 10.x before 10.0.11, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.
  • SA51358: Mozilla Firefox / Thunderbird Multiple Vulnerabilities
  • SA51381: Mozilla SeaMonkey Multiple Vulnerabilities
  • SA51382: Mozilla Firefox / Thunderbird Multiple Vulnerabilities

Platforms Affected:

  • Mozilla Firefox 16
  • Mozilla Firefox ESR 10.0.10
  • Mozilla Seamonkey 2.13
  • Mozilla Thunderbird 16.0
  • Mozilla Thunderbird ESR 10.0.10


Nov 20, 2012

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