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mozillaMozilla FoundationMFSA2010-33
HistoryJun 22, 2010 - 12:00 a.m.

User tracking across sites using Math.random() β€” Mozilla

2010-06-2200:00:00
Mozilla Foundation
www.mozilla.org
28

5.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.021 Low

EPSS

Percentile

88.8%

Security researcher Amit Klein reported that it was possible to reverse engineer the value used to seed Math.random(). Since the pseudo-random number generator was only seeded once per browsing session, this seed value could be used as a unique token to identify and track users across different web sites.

5.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

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

0.021 Low

EPSS

Percentile

88.8%