Stack-Overflow in libsass library

[lcytxw]

Stack-Overflow in libsass library
Version : master
Reproduce:
$./sassc poc10

poc download here:
https:/lcytxw/libsass-collAfl/blob/master/poc10

ASAN debugging information:

Program received signal SIGSEGV, Segmentation fault.
0x000000000043f8d0 in strcmp ()
(gdb) bt
#0 0x000000000043f8d0 in strcmp ()
#1 0x00007ffff72f03d4 in std::type_info::operator== (__arg=..., this=)
at /usr/bin/../lib/gcc/x86_64-linux-gnu/5.2.1/../../../../include/c++/5.2.1/typeinfo:124
#2 Sass::CastSass::Parent_Selector (ptr=) at ./ast.hpp:145
#3 Sass::Complex_Selector::resolve_parent_refs (this=, pstack=..., implicit_parent=true)
at ast.cpp:1295
#4 0x00007ffff72f0041 in Sass::Complex_Selector::resolve_parent_refs (this=, pstack=...,
implicit_parent=true) at ast.cpp:1288
#5 0x00007ffff72f0041 in Sass::Complex_Selector::resolve_parent_refs (this=, pstack=...,
implicit_parent=true) at ast.cpp:1288
#6 0x00007ffff72ef2f9 in Sass::Selector_List::resolve_parent_refs (this=, pstack=...,
implicit_parent=) at ast.cpp:1268
#7 0x00007ffff72f0bab in Sass::Complex_Selector::resolve_parent_refs (this=, pstack=...,
implicit_parent=true) at ast.cpp:1409
#8 0x00007ffff72ef2f9 in Sass::Selector_List::resolve_parent_refs (this=, pstack=...,
implicit_parent=) at ast.cpp:1268
#9 0x00007ffff72f0bab in Sass::Complex_Selector::resolve_parent_refs (this=, pstack=...,
implicit_parent=true) at ast.cpp:1409
...

Credits:

This vulnerability is detected by team OWL337, with our custom fuzzer collAFL. Please contact [email protected] and [email protected] if you need more info about the team, the tool or the vulnerability.