Binwalk dd gzip
It fails, likely my offsets are off, but you get the picture. Squashfs and Cramfs are much easier to extract, and the steps are the same, Happy Hunting!
Huge thanks to the author of binwalk and owner of http: He wrote in with some awesome helpful tips for pulling apart the DIR firmware:. So the JFFS2 signatures that you were seeing were just false positive matches. What sticks out to me though is the gzip match in the gzipped data extracted from the firmware image:. The gzip match has a timestamp that is within one minute of the original gzipped file found in the firmware update image at offset 0x40, so that's a good sign.
So basically the file system was built as a compressed CPIO archive, then concatenated with the kernel, then the whole thing was gzipped. Be sure to check out his web site and training! From Paul's Security Weekly.
Retrieved from " https: 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