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Privoxy


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#1 bigdog1100

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Posted 29 May 2012 - 03:51 PM

Hello. I just stumbled upon Privoxy. Being familiar with proxy servers and reading what Privoxy does, I am still somewhat unclear. Aside from blocking ads, does it do anything else? If yes, would you please tell me specifically what? Also what does "non-caching" means in the context of this application?

http://www.privoxy.org/ :busy:

Motherboard: ASUS P8Z68-V LX; Processor: Intel i5 2500k; RAM 24GB: CORSAIR XMS3 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); CORSAIR Vengeance 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); Video Card: MSI AMD Radeon RX 470 Gaming X 4G GDDR5; Storage: HDD 2TB Seagate ST2000DM001-9YN164; SSD 500GB Samsung 860 EVO 500GB;Power Supply:  OCZ ZS Series 650W 80PLUS Bronze High Performance Power Supply; Multi-card reader: Nippon Labs Delux 3.5" Internal All In One Card Reader/Writer with USB2.0 & eSATA Ports Model ICR-BB. Optical 1: LG GH22NS90; Optical 2:  ASUS BW-12B1ST; Fans: 3x80mm, CPU Cooling: XIGMATEK LOKI SD963. So there are total of 6 fans.
 


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#2 Didier Stevens

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Posted 29 May 2012 - 04:07 PM

Privoxy is a local proxy server, i.e. a proxy server that runs on your machine. You configure your browser to use the Privoxy server, and then Privoxy filters your request, for example by removing adds. It is often used in combination with TOR to enhance your privacy, for example by blocking web bugs or javascript that could reveal your real IP.
But you can also configure it with your own rules.

Non-caching means that it doesn't cache your request results, i.e. keep a local copy of the result. When you say you are familiar with proxy servers, do you mean anonymizing proxy servers on the Internet, or corporate/ISP proxy servers? Corporate & ISP proxy servers cache pages to reduce traffic.

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#3 bigdog1100

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Posted 29 May 2012 - 04:23 PM

Anonymizing proxies. Thank you for your answer. So essentially Privoxy is a local application that does not send requests to it's "home" server outside my PC, to then block anything, and is purely local application (proxy server) as you said? Am I understanding this correctly?

Also, how do I configure it to block web-bugs, or does it do it by itself?

Edited by bigdog1100, 29 May 2012 - 04:25 PM.

Motherboard: ASUS P8Z68-V LX; Processor: Intel i5 2500k; RAM 24GB: CORSAIR XMS3 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); CORSAIR Vengeance 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); Video Card: MSI AMD Radeon RX 470 Gaming X 4G GDDR5; Storage: HDD 2TB Seagate ST2000DM001-9YN164; SSD 500GB Samsung 860 EVO 500GB;Power Supply:  OCZ ZS Series 650W 80PLUS Bronze High Performance Power Supply; Multi-card reader: Nippon Labs Delux 3.5" Internal All In One Card Reader/Writer with USB2.0 & eSATA Ports Model ICR-BB. Optical 1: LG GH22NS90; Optical 2:  ASUS BW-12B1ST; Fans: 3x80mm, CPU Cooling: XIGMATEK LOKI SD963. So there are total of 6 fans.
 


#4 Didier Stevens

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Posted 29 May 2012 - 04:29 PM

Yes, it does send requests to the websites you are viewing, it does not use a proxy server itself (although you can configure it to use one).

Web bugs are filtered by default.

Didier Stevens
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If you send me messages, per Bleeping Computer's Forum policy, I will not engage in a conversation, but try to answer your question in the relevant forum post. If you don't want this, don't send me messages.

 

Stevens' law: "As an online security discussion grows longer, the probability of a reference to BadUSB approaches 1.0"


#5 bigdog1100

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Posted 29 May 2012 - 04:39 PM

Thank you very much. :thumbup2:

Motherboard: ASUS P8Z68-V LX; Processor: Intel i5 2500k; RAM 24GB: CORSAIR XMS3 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); CORSAIR Vengeance 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); Video Card: MSI AMD Radeon RX 470 Gaming X 4G GDDR5; Storage: HDD 2TB Seagate ST2000DM001-9YN164; SSD 500GB Samsung 860 EVO 500GB;Power Supply:  OCZ ZS Series 650W 80PLUS Bronze High Performance Power Supply; Multi-card reader: Nippon Labs Delux 3.5" Internal All In One Card Reader/Writer with USB2.0 & eSATA Ports Model ICR-BB. Optical 1: LG GH22NS90; Optical 2:  ASUS BW-12B1ST; Fans: 3x80mm, CPU Cooling: XIGMATEK LOKI SD963. So there are total of 6 fans.
 


#6 bigdog1100

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Posted 29 May 2012 - 10:00 PM

I read some more about it and someone said this: "We don't recommend using privoxy.....The reason why we don't recommend it is that it sets up a listening server and that's a potential security hole." Is this something to worry about?

Motherboard: ASUS P8Z68-V LX; Processor: Intel i5 2500k; RAM 24GB: CORSAIR XMS3 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); CORSAIR Vengeance 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); Video Card: MSI AMD Radeon RX 470 Gaming X 4G GDDR5; Storage: HDD 2TB Seagate ST2000DM001-9YN164; SSD 500GB Samsung 860 EVO 500GB;Power Supply:  OCZ ZS Series 650W 80PLUS Bronze High Performance Power Supply; Multi-card reader: Nippon Labs Delux 3.5" Internal All In One Card Reader/Writer with USB2.0 & eSATA Ports Model ICR-BB. Optical 1: LG GH22NS90; Optical 2:  ASUS BW-12B1ST; Fans: 3x80mm, CPU Cooling: XIGMATEK LOKI SD963. So there are total of 6 fans.
 


#7 Didier Stevens

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Posted 30 May 2012 - 06:53 AM

I found this quote with Google. The person should have explained better what his motivation is for that recommendation, because it is not clear to me.

I can only guess that the poster wrongly assumes that Privoxy opens a listening port on a LAN interface, e.g. with the IP address of your machine. This would mean that another person that has remote access to your machine, can use your Privoxy (unauthenticated) to access the Internet.

But this is not the case, by default Privoxy only opens a port on local host, i.e. 127.0.0.1. This can't be accessed remotely.

Didier Stevens
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http://DidierStevensLabs.com

SANS ISC Senior Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2019
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If you send me messages, per Bleeping Computer's Forum policy, I will not engage in a conversation, but try to answer your question in the relevant forum post. If you don't want this, don't send me messages.

 

Stevens' law: "As an online security discussion grows longer, the probability of a reference to BadUSB approaches 1.0"


#8 bigdog1100

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Posted 30 May 2012 - 09:01 AM

Again, thank you.For your reference it is here. http://knosproject.proboards.com/index.cgi?board=9rc&action=display&thread=165

Edited by bigdog1100, 30 May 2012 - 09:03 AM.

Motherboard: ASUS P8Z68-V LX; Processor: Intel i5 2500k; RAM 24GB: CORSAIR XMS3 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); CORSAIR Vengeance 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800); Video Card: MSI AMD Radeon RX 470 Gaming X 4G GDDR5; Storage: HDD 2TB Seagate ST2000DM001-9YN164; SSD 500GB Samsung 860 EVO 500GB;Power Supply:  OCZ ZS Series 650W 80PLUS Bronze High Performance Power Supply; Multi-card reader: Nippon Labs Delux 3.5" Internal All In One Card Reader/Writer with USB2.0 & eSATA Ports Model ICR-BB. Optical 1: LG GH22NS90; Optical 2:  ASUS BW-12B1ST; Fans: 3x80mm, CPU Cooling: XIGMATEK LOKI SD963. So there are total of 6 fans.
 





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