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February 26, 2017 10:00 pm

Apache Subversion Fails SHA-1 Collision Test, Exploit Moves Into The Wild

WebKit's bug-tracker now includes a comment from Friday noting "the bots all are red" on their git-svn mirror site, reporting an error message about a checksum mismatch for shattered-2.pdf. "In some cases, due to the corruption, further commits are blocked," reports the official "Shattered" web site. Slashdot reader Artem Tashkinov explains its significance:A WebKit developer who tried to upload "bad" PDF files generated from the first successful SHA-1 attack broke WebKit's SVN repository because Subversion uses SHA-1 hash to differentiate commits. The reason to upload the files was to create a test for checking cache poisoning in WebKit. Another news story is that based on the theoretical incomplete description of the SHA-1 collision attack published by Google just two days ago, people have managed to recreate the attack in practice and now you can download a Python script which can create a new PDF file with the same SHA-1 hashsum using your input PDF. The attack is also implemented as a website which can prepare two PDF files with different JPEG images which will result in the same hash sum.

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