Adobe Flash – Pointer Crash in XML Handling

  • 作者： Google Security Research
    日期： 2015-08-19
  • 类别：
    平台：
  • 来源：https://www.exploit-db.com/exploits/37870/
  • Source: https://code.google.com/p/google-security-research/issues/detail?id=400&can=1&q=label%3AProduct-Flash%20modified-after%3A2015%2F8%2F17&sort=id

The attached sample file, signal_sigsegv_7ffff637297a_8900_e3f87b25c25db8f9ec3c975f8c1211cc.swf, crashes, perhaps relating to XML handling.

The crash looks like this on Linux x64:

=> 0x00007f6931226f22:	mov0x8(%rcx),%eax
rcx0x303030303030300	217020518514230016

The wider context shows that the wild pointer target can be incremented with this vulnerability, which is typically enough for an exploit:

=> 0x00007f6931226f22:	mov0x8(%rcx),%eax<--- read
 0x00007f6931226f25:	test %eax,%eax
 0x00007f6931226f27:	je 0x7f6931226f80
 0x00007f6931226f29:	test $0x40000000,%eax
 0x00007f6931226f2e:	jne0x7f6931226f80
 0x00007f6931226f30:	add$0x1,%eax <--- increment
 0x00007f6931226f33:	cmp$0xff,%al
 0x00007f6931226f35:	mov%eax,0x8(%rcx)<--- write back

The base sample from which this fuzz case was generated is also attached, e3f87b25c25db8f9ec3c975f8c1211cc.swf

Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/37870.zip