A nasty looking crash is manifesting in various different ways under fuzzing

vendor:

N/A

by:

Google Security Research

7.5

CVSS

HIGH

Crash

119

CWE

Product Name: N/A

Affected Version From: N/A

Affected Version To: N/A

Patch Exists: YES

Related CWE: N/A

CPE: N/A

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Linux

2015

A nasty looking crash is manifesting in various different ways under fuzzing

A nasty looking crash is manifesting in various different ways under fuzzing, apparently related to drawing and bitmap handling. The crash on 64-bit Linux looks like this: rax 0x83071500ff0300 36881008741516032. If we trace through the usages of %rax, we can get to some bad writes pretty easily. A trigger is attached, signal_sigsegv_7ffff5b5aee2_252_0688bbd450e7c095265d00be2fca50ab.swf and the base file from which this fuzz case was generated is also attached, 0688bbd450e7c095265d00be2fca50ab.swf.

Mitigation:

Ensure that all input is validated and sanitized before being used in any operations.

Source

Exploit-DB raw data:

Source: https://code.google.com/p/google-security-research/issues/detail?id=396&can=1&q=label%3AProduct-Flash%20modified-after%3A2015%2F8%2F17&sort=id

A nasty looking crash is manifesting in various different ways under fuzzing, apparently related to drawing and bitmap handling.

A trigger is attached, signal_sigsegv_7ffff5b5aee2_252_0688bbd450e7c095265d00be2fca50ab.swf

The base file from which this fuzz case was generated is attached, 0688bbd450e7c095265d00be2fca50ab.swf

The crash on 64-bit Linux looks like this:

=> 0x00007f69314b8f7d:	cmpl   $0xc,0x174(%rax)

rax            0x83071500ff0300	36881008741516032

If we trace through the usages of %rax, we can get to some bad writes pretty easily:

=> 0x00007f69314b8f7d:	cmpl   $0xc,0x174(%rax)
   0x00007f69314b8f84:	je     0x7f69314b8fa0
...
   0x00007f69314b8fa0:	mov    (%rax),%rdi      <-- rdi compromised
   0x00007f69314b8fa3:	callq  0x7f69314b8810
...
   0x00007f69314b8810:	mov    (%rsi),%edx
   0x00007f69314b8812:	cmp    $0x7ffffff,%edx
   0x00007f69314b8818:	je     0x7f69314b8862
   0x00007f69314b881a:	mov    0x10(%rdi),%eax
   0x00007f69314b881d:	cmp    $0x7ffffff,%eax
   0x00007f69314b8822:	je     0x7f69314b8868
   0x00007f69314b8824:	sub    $0x1,%edx
   0x00007f69314b8827:	cmp    %eax,%edx
   0x00007f69314b8829:	cmovg  %eax,%edx
   0x00007f69314b882c:	mov    0x14(%rdi),%eax
   0x00007f69314b882f:	mov    %edx,0x10(%rdi)  <---- rdi written to

Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/37866.zip