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22-Aug-2017 00:31

"The previous bleed vulnerabilities have typically been out-of-bounds reads, but this one is the use of uninitialized memory," Evans said.

"An uninitialized image decode buffer is used as the basis for an image rendered back to the client." "This leaks server-side memory.

Now, just last week, security researcher Chris Evans demonstrated an 18-byte exploit to the public that could be used to cause Yahoo servers to leak other users' private Yahoo! The exploit abuses a security vulnerability in the Image Magick library, which Evans dubbed "Yahoobleed #1" (YB1) because the flaw caused the service to bleed contents stored in server memory.

The vulnerability actually exists in the obscure RLE (Utah Raster Toolkit Run Length Encoded) image format.

After the discovery of a critical vulnerability that could have allowed hackers to view private Yahoo Mail images, Yahoo retired the image-processing library Image Magick.

Image Magick is an open-source image processing library that lets users resize, scale, crop, watermarking and tweak images.

This type of vulnerability is fairly stealthy compared to an out-of-bounds read because the server will never crash.

However, the leaked secrets will be limited to those present in freed heap chunks." After Evans had submitted his 18-byte exploit code to Yahoo, the company decided to retire the Image Magick library altogether, rather than fixing the issue.

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To show how it is possible to compromise a Yahoo email account, Evans, as a proof-of-concept (Po C) demonstration, created a malicious image containing 18-byte exploit code and emailed it as an email attachment to himself.

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Once the attachment reached the Yahoo's email servers, Image Magick processed the image to generate thumbnails and previews, but due to the execution of Evans' exploit code, the library generated a corrupt image preview for the image attachment.

Once this image attachment is clicked, it launched the image preview pane, causing the service to display portions of images that were still present in the server's memory, instead of the original image.

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