tungwaiyip.info

home

about me

links

Blog

< May 2012 >
SuMoTuWeThFrSa
   1 2 3 4 5
6 7 8 9101112
13141516171819
20212223242526
2728293031  

past articles »

Click for San Francisco, California Forecast

San Francisco, USA

 

&D\anger'"+<b>@?!mb Against Code Injection

I have to build my web app against code injection. I find that the problem requires us to see input string used in several different context.

  • In HTML/XML as text.
  • In HTML/XML as an attribute inside the quote.
  • In URL as query parameter.
  • In JavaScript to dynamically create or edit DOM elements.

In each context, there are different rule in escaping them. Since the data can move from one context to another, they have to be properly escaped in all cases.

To help test for proper escaping, I have come up with a string that has lots of special characters below. Put it in your test database and paste it in your input fields. Observe if this causes problem anywhere. In properly escaped system, the string should be transfered and reconstructed verbatim.

  &D\anger'"+<b>@?!mb

A related issue is whether your code support unicode correctly. I find it helpful to insert a string below into the test data to test it out right from the beginning.

  \u4e09\u570b\u5fd7 or
  三國志

2012.05.01 [] - comments

 

 

blog comments powered by Disqus

past articles »

 

BBC News

 

US child migrants: Melania speaks out on Trump separation policy (18 Jun 2018)

 

Conservative newcomer Ivan Duque wins Colombia's presidential election (18 Jun 2018)

 

Taliban rules out extension of Afghanistan Eid festival ceasefire (17 Jun 2018)

 

Computer game addiction: 'I spend 20 plus hours a week gaming' (17 Jun 2018)

 

American Brooks Koepka wins US Open (17 Jun 2018)

 

Brilliant Mexico stun champions Germany (17 Jun 2018)

 

New Jersey arts festival: One shooter dead and 22 injured (17 Jun 2018)

 

Macedonia name dispute: PMs watch as ministers sign 'historic' deal (17 Jun 2018)

 

Aquarius in Valencia: Spain welcomes migrants from disputed ship (17 Jun 2018)

 

Nigeria attacks: Blasts and rockets 'kill 31' in Borno state (17 Jun 2018)

more »

 

SF Gate

 

Best 55-inch TVs for watching the World Cup (17 Jun 2018)

 

Amazon Studios’ new boss is reshaping its strategy. Step one: lure talent (16 Jun 2018)

 

Driverless cars may cut traffic jams, not insurance premiums (16 Jun 2018)

 

Pregnancy discrimination is rampant inside America’s biggest companies (16 Jun 2018)

 

Contest aims to lift personal flying machines off the page (15 Jun 2018)

 

ICYMI: No ‘Madden 19’ anthem; finding right King novel; great Curry tweet (15 Jun 2018)

more »


Site feed Updated: 2018-Jun-17 21:00