Jump to content

Hacker Technology

A group blog by Leader in Hacker Website - Providing Professional Ethical Hacking Services

  • Entries

    16114

  • Comments

    7952

  • Views

    863107765

Contributors to this blog

  • HireHackking 16114

About this blog

Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
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:	mov    0x8(%rcx),%eax
rcx            0x303030303030300	217020518514230016

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

=> 0x00007f6931226f22:	mov    0x8(%rcx),%eax    <--- read
   0x00007f6931226f25:	test   %eax,%eax
   0x00007f6931226f27:	je     0x7f6931226f80
   0x00007f6931226f29:	test   $0x40000000,%eax
   0x00007f6931226f2e:	jne    0x7f6931226f80
   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