Bug Hunter Diary

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General CommandsCommandgDescriptionBegins or resumes execution on the target.BreakpointsCommandbp addressblbc breakpoint IDDescriptionSets a new breakpoint at the address of the breakpointlocation that is specified in the command.Lists information about existing breakpoints.Removes previously set breakpoints specified by theirbreakpoint ID.Running the DebuggeeCommandtpDescriptionExecutes a single instruction or source line and, optionally,displays the resulting values of all registers andflags. Will step into subfunctions.Executes a single instruction or source line and,optionally, displays the resulting values of all registersand flags. Will not enter subfunctions.Examining DataCommanddd addressdu addressdtpoi(address)DescriptionDisplays the contents of address as double-word values(4 bytes).Displays the contents of address as unicodecharacters.Displays information about a local variable, globalvariable, or data type, including structures andunions.Returns pointer-sized data from the specified address.Depending on the architecture the pointer size is32 bits or 64 bits.166 Appendix B
Information CommandsCommandrkbu addressDescriptionLists registers and their contents.Prints a backtrace of all stack frames.Dumps a range of memory around address as machineinstructions.Other CommandsCommand!analyze -v!drvobj DRIVER_OBJECT.sympath.reloadDescriptionThis debugger extension displays a lot of useful informationabout an exception or bug check.This debugger extension displays detailed informationabout a DRIVER_OBJECT.This command changes the default path of the debuggerfor symbol search.This command deletes all symbol information andreloads these symbols as needed.B.3 windows Kernel DebuggingIn order to analyze the vulnerability described in Chapter 6, I neededa way to debug the Windows kernel. I set up a debugging environmentwith VMware 2 and WinDbg 3 by following these steps:• Step 1: Configure the VMware guest system forremote kernel debugging.• Step 2: Adjust the boot.ini of the guest system.• Step 3: Configure WinDbg on the VMware hostfor Windows kernel debugging.← Throughout thissection, I used thefollowing softwareversions: VMwareWorkstation 6.5.2and WinDbg6.10.3.233.Step 1: Configure the VMware Guest System for Remote KernelDebuggingAfter I installed a Windows XP SP3 VMware guest system, I powered itoff and chose Edit Virtual Machine Settings from the Commands sectionof VMware. I then clicked the Add button to add a new serial portand chose the configuration settings shown in Figures B-1 and B-2.Debugging 167
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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
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 and 178: BDebuggingThis appendix contains in
Page 179: Information CommandsCommandDescript
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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