Bug Hunter Diary

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General CommandsCommand::run argumentsDescriptionRuns the program with the given arguments. If thetarget is currently running or it is a corefile, mdb willrestart the program if possible.BreakpointsCommandaddress::bpDescriptionSets a new breakpoint at the address of the breakpointlocation that is specified in the command.$b Lists information about existing breakpoints.::delete numberRemoves previously set breakpoints specified by theirnumber.Running the DebuggeeCommandDescription:s Executes a single instruction. Will step intosubfunctions.:e Executes a single instruction. Will not entersubfunctions.:c Resumes execution.Examining DataCommandaddress,count/formatDescriptionPrints the specified number of objects (count) foundat address in the specified format; example formatsinclude B (hexadecimal, 1-byte), X (hexadecimal,4-byte), S (string).164 Appendix B
Information CommandsCommandDescription$r Lists registers and their contents.$c Prints a backtrace of all stack frames.address::disDumps a range of memory around address as machineinstructions.Other CommandsCommand::status::msgbufDescriptionPrints a summary of information related to the currenttarget.Displays the message buffer, including all consolemessages up to a kernel panic.B.2 the Windows Debugger (WinDbg)The following tables list some useful debugger commands of WinDbg.For a complete list of available commands, see Mario Hewardt andDaniel Pravat’s Advanced Windows Debugging (Addison-Wesley Professional,2007) or the documentation that comes with WinDbg.Starting and Stopping a Debugging SessionCommandFile4 Open Executable...File4Attach to a Process...qDescriptionClick Open Executable on the File menu to starta new user-mode process and debug it.Click Attach to a Process on the File menu todebug a user-mode application that is currentlyrunning.Ends the debugging session.Debugging 165
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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
Page 127 and 128: 7A Bug Older Than 4.4BSDSaturday, M
Page 129 and 130: Here are some examples:Source code
Page 131 and 132: 1094 return (ENXIO);1095 if (t != t
Page 133 and 134: 4. The assumed address of l_open()
Page 135 and 136: osx$ cat /Library/Logs/panic.logSat
Page 137 and 138: Back on the Linux host, I started t
Page 139 and 140: 0x35574c, the value is used to calc
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: BDebuggingThis appendix contains in
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 and 188: Other CommandsCommandset disassembl
Page 189 and 190: linux# pwd/home/tk/gdb-292/srclinux
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
Page 202 and 203: zonecfg:wwwzone> set autoboot=truez
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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