Bug Hunter Diary

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Step 2: Get the Necessary Software PackagesAfter I had successfully installed the Linux host, I downloaded the followingsoftware packages:• Source code of Apple’s custom gdb version. 6• Standard gdb source code from GNU. 7• A patch for Apple’s gdb to compile under Linux. 8• The appropriate source code version of the XNU kernel. Iprepared the Linux debugging host to research the kernelbug described in Chapter 7, so I downloaded the XNU version792.13.8. 9• The appropriate version of Apple’s Kernel Debug Kit. I found thebug explored in Chapter 7 on Mac OS X 10.4.8, so I downloadedthe corresponding Kernel Debug Kit version 10.4.8 (Kernel_Debug_Kit_10.4.8_8L2127.dmg).Step 3: Build Apple’s Debugger on the Linux HostAfter I downloaded the necessary software packages onto the Linuxhost, I unpacked the two versions of gdb:linux$ tar xvzf gdb-292.tar.gzlinux$ tar xvzf gdb-5.3.tar.gzThen I replaced the mmalloc directory of Apple’s source tree withthe one from GNU gdb:linux$ mv gdb-292/src/mmalloc gdb-292/src/old_mmalloclinux$ cp -R gdb-5.3/mmalloc gdb-292/src/I applied the patch to Apple’s gdb version:linux$ cd gdb-292/src/linux$ patch -p2 < ../../osx_gdb.patchpatching file gdb/doc/stabs.texinfopatching file gdb/fix-and-continue.cpatching file gdb/mach-defs.hpatching file gdb/macosx/macosx-nat-dyld.hpatching file gdb/mi/mi-cmd-stack.clinux$ suPassword:I used the following commands to build the necessary libraries:174 Appendix B
linux# pwd/home/tk/gdb-292/srclinux# cd readlinelinux# ./configure; makelinux# cd ../bfdlinux# ./configure --target=i386-apple-darwin --program-suffix=_osx; make;make install→linux# cd ../mmalloclinux# ./configure; make; make installlinux# cd ../intllinux# ./configure; make; make installlinux# cd ../libibertylinux# ./configure; make; make installlinux# cd ../opcodeslinux# ./configure --target=i386-apple-darwin --program-suffix=_osx; make;make install→To build the debugger itself, I needed to copy some header filesfrom the XNU kernel source code to the include directory of theLinux host:linux# cd /home/tklinux# tar -zxvf xnu-792.13.8.tar.gzlinux# cp -R xnu-792.13.8/osfmk/i386/ /usr/include/linux# cp -R xnu-792.13.8/bsd/i386/ /usr/include/cp: overwrite `/usr/include/i386/Makefile'? ycp: overwrite `/usr/include/i386/endian.h'? ycp: overwrite `/usr/include/i386/exec.h'? ycp: overwrite `/usr/include/i386/setjmp.h'? ylinux# cp -R xnu-792.13.8/osfmk/mach /usr/include/I then commented some typedefs in the new _types.h file to avoidcompile-time conflicts (see line 39, lines 43 to 49, and lines 78 to 81):linux# vi +38 /usr/include/i386/_types.h[..]38 #ifdef __GNUC__39 // typedef __signed char __int8_t;40 #else /* !__GNUC__ */41 typedef char __int8_t;42 #endif /* !__GNUC__ */43 // typedef unsigned char __uint8_t;44 // typedef short __int16_t;45 // typedef unsigned short __uint16_t;46 // typedef int __int32_t;47 // typedef unsigned int __uint32_t;48 // typedef long long __int64_t;49 // typedef unsigned long long __uint64_t;..Debugging 175
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A Bug Hunter’s Diary. Copyright
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Chapter 3: Escape from the WWW Zone
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B.2 The Windows Debugger (WinDbg) .
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IntroductionWelcome to A Bug Hunter
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1Bug HuntingBug hunting is the proc
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After I’ve found a bug, I want to
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Table 1-1: Debuggers Used in This B
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2Back to the ’90sSunday, October
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16361637 /* clear the SEQ table */1
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If a TiVo file is loaded by VLC, th
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Get the →vulnerableWindows versio
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EIP = 41414141 . . . Mission EIP co
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NoteTo configure Process Explorer t
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See the following excerpt from the
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3. Immunity Debugger is a great Win
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NoteInput/output controls (IOCTLs)
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msgbb_datapdatabb_rptrdb_basedatabu
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8180 /*8181 * Null terminate the st
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26736 /*26737 * SIOC[GS]TUNPARAM ap
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19165 * are also rejected as they i
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01 #include 02 #include 03 #include
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fffffe8000f7e4b0 unix:die+da ()ffff
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zero pagenot mappedzero pageis mapp
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gaining full control over EIP/RIP a
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112 return 1;113 }114115 printf ("O
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solaris$ isainfo -b64I then compile
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ip_output+0x10()ip_wput+0x37()putne
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Notes1. The source code of OpenSola
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4.1 Vulnerability DiscoveryTo find
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167 if (current_track + 1 > fourxm-
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Step 1: Find a Sample 4X Movie File
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Next, I modified the values of trac
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Table 4-2: List of the Assembler In
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63 #elif defined (HAVE_MEMALIGN)64
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linux$ gdb -q ./ffmpeg_g(gdb) run -
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(UINT_MAX / sizeof(AudioTrack) - 1)
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7ebe000-b7ec0000 r--p 0015c000 08:0
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5Browse and You’re OwnedSunday, A
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{SWI.ClassId_q.ClassId clsid = new
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27 except KeyboardInterrupt:28 prin
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Figure 5-4: Defining a breakpoint a
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Figure 5-7: User-controlled argumen
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Next, I tried to retrieve the size
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05 06 arg = String(232, "A") + Stri
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iDefense VCPnotifiedVulnerability d
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6.1 Vulnerability DiscoveryI used t
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Step 3: Check the Device Security S
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Below, the elements of the MajorFun
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At address .text:00010748, a pointe
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[..][..]//// Current stack location
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The transfer type is specified usin
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If the requested IOCTL code matches
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Figure 6-5: Graph view of the vulne
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.text:00010DBA push 1 ; _DWORD.text
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99 // .text:00010DEF cmp dword ptr
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nt!RtlpBreakWithStatusInstruction:8
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After I gained control over EIP, I
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7A Bug Older Than 4.4BSDSaturday, M
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Here are some examples:Source code
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1094 return (ENXIO);1095 if (t != t
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4. The assumed address of l_open()
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osx$ cat /Library/Logs/panic.logSat
Page 137 and 138: Back on the Linux host, I started t
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Page 141 and 142: 48 define search_memloc49 set $max_
Page 143 and 144: As the debugger output shows, the E
Page 145: ApplenotifiedApple asks formore det
Page 148 and 149: I performed the following steps whe
Page 150 and 151: I then began fuzzing files of the A
Page 152 and 153: Figure 8-1: Playing the unmodifiedA
Page 154 and 155: • Line 40 copies the current proc
Page 156 and 157: As the debugger output shows, media
Page 158 and 159: The manipulated byte (0xff) that ca
Page 160 and 161: (gdb) x/12x 0x1301bfc0x1301bfc: 0x0
Page 162 and 163: ApplenotifiedApple confirmsthe vuln
Page 164 and 165: Every function of a process that is
Page 166 and 167: eip 0x43434343 0x43434343eflags 0x1
Page 168 and 169: The access violation is caused when
Page 170 and 171: is less than 12. If it is, the stri
Page 172 and 173: The program in Listing A-4 calls th
Page 174 and 175: 0x080483f3 : mov DWORD PTR [esp+0x4
Page 177 and 178: BDebuggingThis appendix contains in
Page 179 and 180: Information CommandsCommandDescript
Page 181 and 182: Information CommandsCommandrkbu add
Page 183 and 184: Figure B-3: Configuration settings
Page 185 and 186: Figure B-6: Attaching the kernel de
Page 187: Other CommandsCommandset disassembl
Page 191: Notes1. See the Solaris Modular Deb
Page 194 and 195: The many mitigation techniques coul
Page 196 and 197: Figure C-1: DEP and ASLR status sho
Page 198 and 199: 08 p[0] = 0x41414141;09 printf (“
Page 200 and 201: ConclusionIn case of a buffer overf
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Page 204 and 205: Notes1. See Rob King, “New Leopar
Page 206 and 207: COMRaider, 72coordinated disclosure
Page 208 and 209: Rreadelf, 161RELRO, 67-69, 183-186r
Page 210: A Bug Hunter’s Diary is set in Ne
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