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mozillaMozilla FoundationMFSA2011-43
HistorySep 27, 2011 - 12:00 a.m.

loadSubScript unwraps XPCNativeWrapper scope parameter — Mozilla

2011-09-2700:00:00
Mozilla Foundation
www.mozilla.org
44

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

EPSS

0.003

Percentile

69.7%

David Rees reported that the JSSubScriptLoader (a feature used by some add-ons) was “unwrapping” XPCNativeWrappers when they were used as the scope parameter to loadSubScript(). Without the protection of the wrappers the add-on could be vulnerable to privilege escalation attacks from malicious web content. Whether any given add-on were vulnerable would depend on how the add-on used the feature and whether it interacted directly with web content, but we did find at least one vulnerable add-on and presume there are more.

Affected configurations

Vulners
Node
mozillafirefoxRange<7
OR
mozillaseamonkeyRange<2.4

CVSS2

4.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

EPSS

0.003

Percentile

69.7%