J-Security Center

Title: Apple Safari Password Manager Cross-Site Information Disclosure Weakness

Severity: MODERATE

Description:

Apple Safari is prone to an information-disclosure weakness because it fails to properly notify users of the automatic population of form fields in disparate URLs deriving from the same domain.

Specifically, the Safari fails to ensure that form elements are visible prior to populating them with saved form data such as user credentials. This enables an attacker to post a fictitious login form that is automatically populated by form data from another page deriving from the same domain. Considering that attackers can hide such forms from the user's view, this weakness may enable the surreptitious theft of user credentials.

This issue is similar to BID 21240 (Mozilla Firefox 2 Password Manager Cross-Site Information Disclosure Weakness), but rather than using the 'display:none' CSS property to hide the form elements, attackers use 'width:0px'.

This issue may allow attackers to obtain user credentials that have been saved in forms deriving from the same website where attack code resides. The most common manifestation of this condition would typically be in blogs or forums. This may allow attackers to gain access to potentially sensitive information that would aid in phishing attacks.

Affected Products:

  • Apple Safari 2.0.4

References:

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