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In a previous post I obtained the Linksys Ev2 firmware , now I plan to break it apart and see what I can find. Well this is a great start. We know we are dealing with Linux, and that this is a normal uImage. I then move on to use a neat little tool called binwalk. By using libmagic, binwalk tries to find interesting sections of the file. JFFS2 is a popular embedded file system, so we can guess the bulk of the file system is here. Next we can extract each section using dd:. Notice we are using a block size of 1 so we can count in bytes , and we skip the offset into the file.
Then we manually work out the sizes for the lzma and gzip sections. They can be no larger than their start until the next section. The following set of command can solve that:. There are all the HTML pages, and binaries for example busybox. Now we should go back to image Well straight away trying to decompress image So we can assume that was a incorrectly detected by binwalk.
Lets now try and decompress image So that does indeed produce a large image-2 file, so we can ignore the trailing garbage warning. This turns up a set of false positives. So I take a different approach. This produces a whole host of valid looking strings. A line like this:. Hopefully this will lead to me getting ssh access to the router, and eventually being able to customise the firmware. Toggle navigation Andrew Brampton.
Hacking Linksys Ev2 firmware ev2 firmware linksys Linux In a previous post I obtained the Linksys Ev2 firmware , now I plan to break it apart and see what I can find. Thu Dec 22 OS Kernel Image, compression type: A whole lot of JFFS2 sections..