Internet Exploer 7

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Memory disclosure technique for Internet Explorer 7 / 8 | HITBSecNews

Memory disclosure became an important part of exploit development in the light of various protection mechanisms. The ability to read memory holds multiple benefits for exploit developers. The most obvious one is, of course, the ability to circumvent ASLR - if we can read the content of the memory, we can determine the address of an module, for example by reading a vtable pointer of some object and subtracting a (constant) offset. However, memory disclosure brings additional benefits as well. For example, many exploits rely on a specific (predictable) memory layout. If we can read memory, we do not have to make any guesses regarding the memory layout. Thus, memory disclosure can also be used to improve the reliability of exploits and enable the exploit development in conditions where the memory layout is unpredictable.

One technique for memory disclosure was used by Peter Vreugdenhil in the Pwn2Own 2010 contest ( http://vreugdenhilresearch.nl/Pwn2Own-2010-Windows7-InternetExplorer8.pdf ). This technique consists of overwriting a terminator of a string, which enables reading the memory immediately after the end of the string. This was enough to defeat ASLR, however, in general, it has a disadvantage that it can only read the memory up to the next null-character (that will be interpreted as the new string terminator). Additionally, there is no way to read past the end of current memory block (except if the next memory block begins immediately after the current block, with no unreadable memory in between).

The technique I propose here enables reading a much wider area of memory and also reading memory in other memory blocks, with unreadable memory in between them. The technique itself is very simple, however, since I never saw anyone using or describing it, I decided to describe it here. I successfully used this technique in various exploits for Internet Explorer, most recently in an exploit for a vulnerability in Internet Explorer 8 on Windows 7.

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Windows 2000, which incorporates Internet Exploer 5. demands at least Pentium ... It can function on a 4 MB of RAM and as little as 7 MB of disk space for a ...

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Lima Geog. Soc. Presbyn. Clubs: Cosmos (Wash.); Exploers ... Copenhagen, Denmark , Oct. 7, 1 885; s. Christian and Ellen (Adler) B.; Master's degree U. ...