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swstack.txt

swstack.txt
Posted May 31, 2000
Authored by Sectorx | Site xorteam.cjb.net

Simple Web Server 0.5.1 stack overflow advisory. Allows eip to be overwritten.

tags | exploit, web, overflow
SHA-256 | 48d728d1a0369d0efc66c0322f42866aafd5c4801aa62aeb3619a6c8cd355af1

swstack.txt

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Simple Web Server 0.5.1 bug report
==================================

I have recently noticed an interesting bug in Simple Web Server 0.5.1, while
browsing around various http daemon codes. apperantly sws uses a small routine
that adds your socket input, char by char, into an array of strings
(see request.c->get_request(), line 154). though it doesnt do and bound
checking and keeps on strncat()'ing beyond the string, until %eip.

Core was generated by `xxxxxxxxxxx'. :-)
(gdb) info registers
eax 0xbffffbf5 -1073742859
ecx 0xbfffffff -1073741825
edx 0xa78 2680
ebx 0xbfffc925 -1073755867
esp 0xbfffbee8 0xbfffbee8
ebp 0xbfffbef4 0xbfffbef4
esi 0xbffffbf4 -1073742860
edi 0xbfffc925 -1073755867
eip 0x4007863f 0x4007863f

As you can see, %eip is partly overwritten (0x400_78_63f), which makes the
process lay off course and die. I have already mailed the author and
hoping to see this getting fixed soon.
by the way - if any of you find any use for this please let me know :-)

--SectorX <sectorx@digitalphobia.com> of XOR <http://xorteam.cjb.net>
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