Vivotek Remote Stack Overflow Vulnerability

Author: Brian Karas, Published on Nov 14, 2017

A stack overflow vulnerability in Vivotek cameras has been discovered by bashis, the security researcher who has also found vulnerabilities in cameras from Axis and Dahua, among other brands. The vulnerability is very easy to exploit, and opens up a variety of ways for attackers to impact affected cameras from Vivotek.

Details of the vulnerability have been made public, after Vivotek failed to provide agreed-upon responses to bashis during the initial disclosure process.

In this report we analyze the vulnerability, and Vivotek's handling of it that caused details to be released prior to patched firmware being fully available.

* ***** ******** ************* ** ******* ******* *** **** ********** by ******, *** ******** ********** *** *** **** ***** *************** in ******* ****************, ***** ***** ******. *** ************* ** **** **** ** exploit, *** ***** ** * ******* ** **** *** ********* to ****** ******** ******* **** *******.

******* ** *** ************* **** **** **** ******, ***** ******* failed ** ******* ******-**** ********* ** ****** ****** *** ******* disclosure *******.

** **** ****** ** ******* *** *************, *** *******'* ******** of ** **** ****** ******* ** ** ******** ***** ** patched ******** ***** ***** *********.

[***************]

Vulnerability ********

**** ******* ** *** ************* **** *************** ** ****, *** ********' ****** *******. *** ************* ****** ** ********** ******* **** ** ****** ************* ** ******* ** ***** ****** *****. * *********-******* **** or *** *** ******** *** ************* **** *** *** ******** data ** ****** ** **** *** ******'* ********* *******. ********* are **** **** ** *********** ********* ****** *********, ***** *** cause *** ****** ** *****, ** ** ******* ********* ****.

Very **** *******

** ******* ********, *********, ** ******-******** *******/****** *** ******** ** execute ** ******* ******* ** ******** ******. ****** ******* * long *** **** *** ********* *******, ** ***** ** ******' proof-of-concept, *** ******* *** ********. **** ***** ** ********* **** to ******** ******* **** **** *************.

Affected ********

********* ** ******' ********, *** ********* ****** *** **** ******** with **** *************:

******, ******, ******, ******, *******, *******, *******-*, *******, *******, ********, FD8167AS, *******, *******, *******, ********, ********, ******, ******, *******, *******, FD816C, ******, *******, *******, ******, ******, ******, ******, ******, ******-**, FD8365A_v2, *******, *******, *******, *******, ******, *******, ******, ******, ******, FD8382, ******, ******, ******, ******, *********, *********, ******, *********, *********,******, FE9182, ******, ******, *******, *******, ******, *******, ******, ******, ******, IB8382, ******, ******, ******, ******, ******, ******, ******, ******, ******, SD9161, ******, ******, ******, ******, ******, ******, ******

*** ************* *** ** ******* ** ***** ******* ******** ** well, ******* ** ** ******* ** ********* ***** ****** *** affected.

Firmware ******* ********

*******'* ******** ** *** ******* ************* ********** ********** ********* **** firmware **** ***** ** ****** ********* ** ******** ****:

***** *** ******** *** ******* ** *** ********* ******** ****** starting ** ******** **** *** ******** ****.

Risk ******

***** ** *********** ********* ** ******, ** ** ******** **** vulnerability *** ** **** ** **** ****** ** * ***** shell, ** ** ****/*** ******** ****. ***** ** ** ***** the ****** ** ****/****** ** *** **** ****** ********, ***** could ** **** ** * **** ** ****** ** ******* attack ** *** ******.

Vivotek ****** ********

*** ***** ** ****** ******** ** ****** ** *** *********** claim **** ***** ******* *** ********* **********, *** ******* *** not ******* ** ** ***** **** ******, ***** ******** *** to ******** *** ************* ********, ** ********* ****** ****.

** ** ***** ** ****, ******* ************ *** **** ** communications ** ***** ****, ******* **** *** ******** ** *** for ********** **** ** ******** ******* ** *** ********.

Disclosure ***** ************ ************

***** ****** ***** **** ****** ** **** ** ******** *** details, ******* **** ******* *** ********** ** *** *************, ** was ***** ** ********** ** ** **. ** ***** *********, manufacturers *** ** * ************ ******** ** ******** ***********, *** upon *********** *************** *** *********** ******* *** ***** ** *** and **** *** ************* **** ** *********.

***** ************* *** ****** ** *** **** ********** ** * learning ** ******** ********** *** ***** ******** *****. ******* ********* processes, *** ******, ** ****** ***** ** ************** *** **** open **** *********** ** ***** ** ******** ******* ** ************* disclosures ********* ****** **** *** ***** ******** **** ******* ********.

Comments (11)

******* *** **** ******** *** ****** ******** *** ** ****** models *** **** ************* *****. ** ********* *** ***** ** update *** ******** ****. (***** *** *** ***** **** ****:****://********.*******.***/************/*******/*****-********/*******-*****-********-********-******-*****-********-**-***-******.***). ** ******* **** ** *** ********* ** ******* ******** and **** ***** ******** ****** ** *** ********* *** ******* products

*** ***** ** ****** ******** ** ****** ** *** *********** claim **** ***** ******* *** ********* **********, *** ******* *** not ******* ** ** ***** **** ******, ***** ******** *** to ******** *** ************* ********, ** ********* ****** ****.

* ***** ********** ***** ********, * *** *** ***** **** ** ********* ********** ** manufacturer ******, ****** ******* ** *** ***’* *** *** **** what ** *****.

****** ** **** ** **** *** **************** *** ***** *** ******, **** ** *** **** ***** **** ** less, ** ******** ****.

** *** ***** ***** ******* ** ** * *** **** careful, *** ***** *** **** ***** ** ******* ******* ** be ****** *** ** ******* ****.

********, * **** **** ******** * ** ******** ** ********* FD ** ** *** ****, ** **** ********** **** (************ to *** ******, ** ******).

* ****** ***** ** *********** **** ** **** ***** ** after ******* ******* ** ******, *** * ** ***** ******** for *** ** ****, *** *** *** ******** *** *** to ** ****, ** ***** *** ****** **** ****** ** and ******* *****.

**, * ***'* **** *** *** ***, *** * ****** don't ****, *** ****** ******** *** ***** - * ***** choose ** *** ******** ********, *** **** ** *** ******.

** *** ***** ***** ******* ** ** * *** **** careful, *** ***** *** **** ***** ** ******* ******* ** be ****** *** ** ******* ****.

* *** ****, ******* *** ******* ***** **** *****, ***** gives *** ********** **** *** **** ***** **** ******* ***** have ***** **** ****:

***** ****** ***** **** ****** ** **** ** ******** *** details, ******* **** ******* *** ********** ** *** *************, ** was ***** ** ********** ** ** **.

******** **** ** ********, * *** ********* ** *** *** so ******* **** ** ** ********* **** ***.

***** *** **** *** **** ***** ** **** *********

********, * **** **** ******** * ** ******** ** ********* FD ** ** *** ****, ** **** ********** **** (************ to *** ******, ** ******).

*******, **** ** ***** ** ******* ** *** ** **** actually ***** ***** ** *** **** ******, *** ** ****** how ********* * **** **, * ***** *** **** *** circumstances ****** *** ******** ** *** ****.

****, *'* *** ******* **** ****** ****** **** ***.

* ***'* **** * **** ***** *** *** **** ********, and ** **** * ***'* **** ** *** ***** ** Mr. ***** ** **. *****, **'* **** **** *******, *** mine.

**** ** *** ***** ** ****;

* ***** ** *** ***** *** **** ****, **** ** FD *** ** ****** *************, * ***** **** ** *********** and *** ***** **** *****, ***** *** **** ***** **** me *** **** ** **** **** ***** *********. *** * choose *** ** ** **, * ****** ** **** **** public ** **** *** *** **** **** *** *******.

** **** **, **** ** *** ********** ****** - **** eyes ** ****** ****?

****, *'* *** ******* **** ****** ****** **** ***.

********* ******?

* ****’* ********* *** ** **** ******* ** *** ***. I *** **** ****** * ****** ********, ** *******, “** your ** **** ******** ** ** ** **** ** ***********?”

* **** *** **** ******* *** **** **** ** ******* to *** **** ** **** ************.

/**** * **** ***.

**** ******.

*'* ****** **** ** ****** ************.

**** ****** * ********* (****: *** *******!), * ******** ***** specifically ** **** ***** ***** **** ** **** **** **** (after ** * ******* ** ****), ***** *** ** *** 15+ *************** *** **** **** ****** - *** ********, *** they **** "****** ** *** ** *******", ** ***** * respond "**, * ***** ** ********, **** *** **** *** February".

*** ******** ***'* *****, *** **** ** *** ***** ******** as ** *****.

*******, ** ***** ** ****** ************* **** *** ****** ****** 1st ********, **** ** * ***** ** **-*********, ***** **** for **** ** ** ** *** ****** ****. (* **** not *** ****** ** **-********* *******).

**** * **** ***

/******

* ******* ** ** ********* **** *** *************** *** *********, and **** ***********, **** ******* ** ***** *** *** ******* released * *** ******** *** **.
******* ************ ** *******, * ** *** **** *** ** does *** **** ** **** ***** ** *** *********, *********** more ******* *********.
** **** ** ***** *** **** *************, *** ******* ** one ** ****.
**** ***** ****, *******, ********, ***** (** ***..****), ********* (** OEM ... ****) .. ***, *******, ********..*********. *************** ** *** comments *** *** ****.

****** **** - ********** *******

“**** ******* ************ ******* ************ ******* ****, ********, *****, *********, ISS, *******, *********”

“*******?”

“****** ****”

“****** *** ****** ** ****”

**** ********** ... ***, * ****** ***** **** ... *** I ** *** ***** **** ** *** ******, * ***** it's ***** *** ****.
*** ** *** **** ******* ** *** ***** *** ****, I ***** *** ****** ***** ******** **** ****, *** **** know *** ********.

******* *** ******** *** ******** *** *** **** ** ** camera ****** *** **** ************* *****. ** ********* *** ***** to ****** *** ******** ****. (***** *** *** ***** **** here:****://********.*******.***/************/*******/*****-********/*******-*****-********-********-******-*****-********-**-***-******.***).

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