exploit the possibilities

Adobe Flash Player DLL Hijacking

Adobe Flash Player DLL Hijacking
Posted Jun 17, 2016
Authored by Stefan Kanthak

Adobe Flash Player versions prior to and suffer from a DLL hijacking vulnerability.

tags | exploit
systems | windows
advisories | CVE-2016-1014
MD5 | b6cfb1889815a450c47413304fcd8016

Adobe Flash Player DLL Hijacking

Change Mirror Download
Hi @ll,

the executable (un)installers for Flash Player before version and (both released on 2016-06-15) are
vulnerable to DLL hijacking: they load and execute multiple
Windows system DLLs from their "application directory" instead
of Windows' "system directory" %SystemRoot%\System32\.

On Windows 7 and before they also (try to) load PCACli.dll and
API-MS-Win-Downlevel-Shell32-l1-1-0.dll from the PATH:
PCACli.Dll and API-MS-Win-Downlevel-Shell32-l1-1-0.dll are not
present there, these DLLs were first shipped with Windows 8.

On Windows XP and before they additionally try to load DWMAPI.dll,
PropSys.dll, DevRtl.dll and RPCRTRemote.dll from the PATH: these
DLLs were first shipped with Windows Vista.

See <https://cwe.mitre.org/data/definitions/426.html>,
<https://cwe.mitre.org/data/definitions/427.html> and
<https://capec.mitre.org/data/definitions/471.html> for details
about this well-known and well-documented beginner's error!

Due to the application manifest embedded in the executables which
specifies "requireAdministrator" the installers are run with
administrative privileges ("protected" administrators are prompted
for consent, unprivileged standard users are prompted for an
administrator password); execution of the DLLs therefore results
in an escalation of privilege!

Proof of concept/demonstration:

1. visit (and read) <http://home.arcor.de/skanthak/sentinel.html>,
then download <http://home.arcor.de/skanthak/download/SENTINEL.DLL>
and save it as PCACli.dll, API-MS-Win-Downlevel-Shell32-l1-1-0.dll,
DWMAPI.dll, RPCRTRemote.dll, OLEAcc.dll, PSAPI.dll, SetupAPI.dll,
ClbCatQ.dll, WSock32.dll, WS2_32.dll, HNetCfg.dll, DNSAPI.dll,
IPHlpAPI.dll, RASAPI32.dll, SensAPI.dll, RASAdHlp.dll, RASMan.dll
plus UserEnv.dll, COMRes.dll, WS2Help.dll, TAPI32.dll, RTUtils.dll
SAMLib.dll and WinMM.dll in your "Downloads" directory;

2. fetch the (un)installers for Flash Player released before 2016-06-15
from Adobe's web site and save them in your "Downloads" directory;

3. run the (un)installers downloaded in step 2 and notice the message
boxes displayed from the DLLs placed in step 1.


JFTR: since the (un)installers are 32-bit programs and (un)install
both the 32-bit and 64-bit versions of Flash Player this POC
works on 64-bit Windows too.

stay tuned
Stefan Kanthak


2016-03-12 first vulnerability report sent to Adobe

2016-03-13 Adobe acknowledged the receipt

2016-04-06 Adobe informed about the upcoming patch to be released
2016-04-07 and the assignment of CVE-2016-1014

2016-04-17 second vulnerability report sent to Adobe: the "fixed"
(un)installers are still vulnerable, they just load
some other DLLs now

2016-04-20 Adobe confirmed the second report and announced to fix
the vulnerability in the June update

2016-06-15 Adobe released fixed (un)installers

2016-06-17 report published


RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

February 2020

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Feb 1st
    1 Files
  • 2
    Feb 2nd
    2 Files
  • 3
    Feb 3rd
    17 Files
  • 4
    Feb 4th
    15 Files
  • 5
    Feb 5th
    24 Files
  • 6
    Feb 6th
    16 Files
  • 7
    Feb 7th
    19 Files
  • 8
    Feb 8th
    1 Files
  • 9
    Feb 9th
    2 Files
  • 10
    Feb 10th
    15 Files
  • 11
    Feb 11th
    20 Files
  • 12
    Feb 12th
    12 Files
  • 13
    Feb 13th
    18 Files
  • 14
    Feb 14th
    17 Files
  • 15
    Feb 15th
    4 Files
  • 16
    Feb 16th
    4 Files
  • 17
    Feb 17th
    34 Files
  • 18
    Feb 18th
    15 Files
  • 19
    Feb 19th
    19 Files
  • 20
    Feb 20th
    20 Files
  • 21
    Feb 21st
    15 Files
  • 22
    Feb 22nd
    2 Files
  • 23
    Feb 23rd
    2 Files
  • 24
    Feb 24th
    16 Files
  • 25
    Feb 25th
    37 Files
  • 26
    Feb 26th
    15 Files
  • 27
    Feb 27th
    15 Files
  • 28
    Feb 28th
    4 Files
  • 29
    Feb 29th
    0 Files

Top Authors In Last 30 Days

File Tags


packet storm

© 2016 Packet Storm. All rights reserved.

Security Services
Hosting By