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Mozilla Foundation Security Advisory 2009-48

Insufficient warning for PKCS11 module installation and removal

September 9, 2009
Jesse Ruderman, Dan Kaminsky
Fixed in
  • Firefox 3.0.14


Mozilla security researcher Jesse Ruderman reported that when security modules were added or removed via pkcs11.addmodule or pkcs11.deletemodule, the resulting dialog was not sufficiently informative. Without sufficient warning, an attacker could entice a victim to install a malicious PKCS11 module and affect the cryptographic integrity of the victim's browser.

Security researcher Dan Kaminsky reported that this issue had not been fixed in Firefox 3.0 and that under certain circumstances pkcs11 modules could be installed from a remote location.

Firefox 3.5 releases are not affected.