Created
September 3, 2019 18:29
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null pointer dereference - xpdf 3.04
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xpdf v3.04 | |
PoC: https://gofile.io/?c=QEDJrA | |
$ gdb ./pdfinfo | |
(gdb) run poc.pdf | |
Starting program: /home/input0/Downloads/xpdf-3.04/xpdf/pdfinfo poc.pdf | |
Syntax Error: Couldn't read xref table | |
Syntax Warning: PDF file is damaged - attempting to reconstruct xref table... | |
Syntax Error (895): Illegal character <2f> in hex string | |
Syntax Error (896): Illegal character <50> in hex string | |
Syntax Error (897): Illegal character <72> in hex string | |
Syntax Error (898): Illegal character <6f> in hex string | |
Syntax Error (900): Illegal character <75> in hex string | |
Syntax Error (903): Illegal character <72> in hex string | |
Syntax Error (904): Illegal character <78> in hex string | |
Syntax Error (905): Illegal character <72> in hex string | |
Syntax Error (913): Illegal character <25> in hex string | |
Syntax Error (914): Illegal character <25> in hex string | |
Syntax Error (916): Illegal character <4f> in hex string | |
Syntax Error: Unterminated hex string | |
Syntax Error (380): Dictionary key must be a name object | |
Syntax Error (276): Dictionary key must be a name object | |
Syntax Error (280): Dictionary key must be a name object | |
Syntax Error (300): Dictionary key must be a name object | |
Syntax Error (302): Dictionary key must be a name object | |
Syntax Error (304): Dictionary key must be a name object | |
Syntax Error (306): Dictionary key must be a name object | |
Syntax Error (312): Dictionary key must be a name object | |
Syntax Error (330): Dictionary key must be a name object | |
Syntax Error (332): Dictionary key must be a name object | |
Syntax Error (336): Dictionary key must be a name object | |
Syntax Error (339): Dictionary key must be a name object | |
Syntax Error (345): Dictionary key must be a name object | |
Syntax Error (380): Dictionary key must be a name object | |
Program received signal SIGSEGV, Segmentation fault. | |
0x000000000052102c in XRef::fetch (this=<optimized out>, num=6, gen=0, obj=0x7fffff7ff140, recursion=0) at XRef.cc:999 | |
999 cache[0] = tmp; | |
(gdb) bt | |
#0 0x000000000052102c in XRef::fetch (this=<optimized out>, num=6, gen=0, obj=0x7fffff7ff140, recursion=0) at XRef.cc:999 | |
#1 0x00000000004e20a3 in Object::fetch (this=<optimized out>, xref=<optimized out>, obj=0x2362, recursion=0) at Object.cc:106 | |
#2 0x0000000000414fca in Array::get (this=<optimized out>, i=<optimized out>, obj=0x801550 <__afl_area_initial>) at Array.cc:61 | |
#3 0x0000000000418c88 in Object::arrayGet (i=0, obj=0x7fffff7ff140, this=<optimized out>) at ./Object.h:231 | |
#4 Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:441 | |
#5 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#6 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#7 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#8 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#9 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#10 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#11 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#12 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#13 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#14 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#15 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#16 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#17 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#18 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#19 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#20 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#21 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#22 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#23 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#24 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#25 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#26 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#27 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#28 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#29 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#30 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#31 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#32 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#33 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#34 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#35 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
#36 0x0000000000418c93 in Catalog::countPageTree (this=0x858340, pagesObj=<optimized out>) at Catalog.cc:442 | |
(gdb) i r | |
rax 0x2362 9058 | |
rbx 0xfffffffffffffffc -4 | |
rcx 0x801550 8394064 | |
rdx 0x801550 8394064 | |
rsi 0x7fffff7ff140 140737479962944 | |
rdi 0x856cc8 8744136 | |
rbp 0xfffffffffffffffc 0xfffffffffffffffc | |
rsp 0x7fffff7ff000 0x7fffff7ff000 | |
r8 0x0 0 | |
r9 0x856d08 8744200 | |
r10 0x856d20 8744224 | |
r11 0x246 582 | |
r12 0x6 6 | |
r13 0x856cc8 8744136 | |
r14 0x7fffff7ff140 140737479962944 | |
r15 0x0 0 | |
rip 0x52102c 0x52102c <XRef::fetch(int, int, Object*, int)+2044> | |
eflags 0x10202 [ IF RF ] | |
cs 0x33 51 | |
ss 0x2b 43 | |
ds 0x0 0 | |
es 0x0 0 | |
fs 0x0 0 | |
gs 0x0 0 | |
(gdb) |
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Thank you for the quick response! I accidently used XpdfReader 4.02 on Windows instead of XpdfReader 3.04 on Linux, but your PoC produces a crash nonetheless. The stack trace is considerably different, though. For my purposes, this is sufficient, so thank you very much!
In case you’re interested, here is my stack trace: