Apple Safari 4.0.5 patches critical vulnerabilities

Safari 4.0.5 includes improvements to performance, stability, and security.

ColorSync

An integer overflow that could result in a heap buffer overflow exists in the handling of images with an embedded color profile. Opening a maliciously crafted image with an embedded color profile may lead to an unexpected application termination or arbitrary code execution. The issue is addressed by performing additional validation of color profiles. This issue does not affect Mac OS X systems. Credit to Sebastien Renaud of VUPEN Vulnerability Research Team for reporting this issue.

ImageIO

A buffer underflow exists in ImageIO’s handling of TIFF images. Viewing a maliciously crafted TIFF image may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved bounds checking. For Mac OS X v10.6 systems, this issue is addressed in Mac OS X v10.6.2. For Mac OS X v10.5 systems, this issue is addressed in Security Update 2010-001.

An uninitialized memory access issue exists in ImageIO’s handling of BMP images. Visiting a maliciously crafted website may result in sending data from Safari’s memory to the website. This issue is addressed through improved memory handling and additional validation of BMP images.

An uninitialized memory access issue exists in ImageIO’s handling of TIFF images. Visiting a maliciously crafted website may result in sending data from Safari’s memory to the website. This issue is addressed through improved memory handling and additional validation of TIFF images.

A memory corruption issue exists in the handling of TIFF images. Processing a maliciously crafted TIFF image may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved memory handling.

PubSub

An implementation issue exists in the handling of cookies set by RSS and Atom feeds. Visiting or updating a feed may result in a cookie being set, even if Safari is configured to block cookies via the “Accept Cookies” preference. This update addresses the issue by respecting the preference while updating or viewing feeds.

Safari

An issue in Safari’s handling of external URL schemes may cause a local file to be opened in response to a URL encountered on a web page. Visiting a maliciously crafted website may lead to arbitrary code execution. This update addresses the issue through improved validation of external URLs. This issue does not affect Mac OS X systems.

WebKit

A memory corruption issue exists in WebKit’s handling of CSS format() arguments. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved handling of CSS format() arguments.

A use-after-free issue exists in the handling of HTML object element fallback content. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved memory reference tracking.

A use-after-free issue exists in WebKit’s parsing of XML documents. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved memory reference tracking.

A use-after-free issue exists in the handling of HTML elements containing right-to-left displayed text. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved memory reference tracking.

A use-after-free issue exists in WebKit’s handling of incorrectly nested HTML tags. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved memory reference tracking.

An implementation issue exists in WebKit’s handling of cross-origin stylesheet requests. Visiting a maliciously crafted website may disclose the content of protected resources on another website. This update addresses the issue by performing additional validation on stylesheets that are loaded during a cross-origin request.

A use-after-free issue exists in WebKit’s handling of callbacks for HTML elements. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved memory reference tracking.

A use-after-free issue exists in the rendering of content with a CSS display property set to ‘run-in’. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved memory reference tracking.

A use-after-free issue exists in WebKit’s handling of HTML image elements. Visiting a maliciously crafted website may lead to an unexpected application termination or arbitrary code execution. This issue is addressed through improved memory reference tracking.

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