title: Potential DoS through abuse of rate limit in libunity-webapps for Firefox
description: The unity-firefox-extension package could be tricked into dropping a C callback which was still in use, which Firefox would then free, causing Firefox to crash. This could be achieved by adding an action to the launcher and updating it with new callbacks until the libunity-webapps rate limit was hit. Fixed in 3.0.0+14.04.20140416-0ubuntu1.14.04.1 of unity-firefox-extension and in all versions of libunity-webapps by shipping an empty unity-firefox-extension package, thus disabling the extension entirely and invalidating the attack against the libunity-webapps package.
problem types: CWE-404 Improper Resource Shutdown or Release
affected:
{
product: unity-firefox-extension
vendor: Canonical
versions:
lessThan: 3.0.0+14.04.20140416-0ubuntu1.14.04.1, status: affected, version: 3.0.0, versionType: custom
}
{
product: libunity-webapps
vendor: Canonical
versions:
lessThan: 2.5.0~+14.04.20140409-0ubuntu1, status: affected, version: 2.5.0, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 4.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
version: 3.1
]