glibc detected *** double free or corruption

[sebastiaan.veenstra at gmail.com (Sebastiaan Veenstra)]

Hi,

As far as i know, the newer glibc version are using some kind of protection
mechanism against malloc overflows. When the boundary information between
chunks is overwritten due to a overflow, glibc will detect. I don't know a
technique to bypass this mechanism. I'd be glad if someone can provide me
with information about bypassing this protection mechanism.

Greets,

Sebastiaan Veenstra


On 4/15/06, Sebastian Funk <sebastian.funk at gmail.com> wrote:
> Hi,
>
> I'm trying the "apache_chunked_win32"-exploit, but I get that error
> after a few trys:
>
>         [*] Trying Apache.org Build 1.3.17->1.3.24 (Windows 2000)
> [ 0x1c0f13e5/7 ]
>         ....
>         *** glibc detected *** double free or corruption (!prev):
> 0x09570ad8
> ***
>
> What does that mean?
>
> Greetings,
> Sebastian
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