Extraído de: http://seclists.org/fulldisclosure/2012/Oct/101
From: auto62098873 () hushmail com
Date: Sun, 14 Oct 2012 16:15:05 +0100
Santander are a joke when it comes to
security. Fed up of two years of battling with them to fix issues any other
bank
would have fixed in seconds, things like XSS
on login pages etc. Time to hit full disclosure with some of these issues
in the hope they'll change their game and
start to take their customers security seriously:
*Advisory Information*
Title:
Sensitive Data In Cookies
Date
published: 2012-03-31 08:16:26 PM
upSploit Ref: UPS-2012-0004
*Advisory Summary*
Santander's online banking stores a sensitive,
including full credit card numbers, in its cookies putting this
information at risk.
*Vendor*
Santander (UK)
*Affected Software*
Online
Banking
https://retail.santander.co.uk
(confirmed for personal online banking)
*Description of Issue*
Santander online banking unnecessarily stores
sensitive information within cookies. Depending on which areas of online
banking the user visits this information may
include the following:
* Full name
* PAN (Credit card number)
* Bank account number and sort code
* Alias
* UserID
Of particular concern is the full PAN, which
PCI DSS states should be rendered unreadable anywhere it is stored.
Within Santander's "Security &
Privacy" section they state that: "Santander's site-tracking cookies
don’t contain name
or address information". The use of
cookies is therefore not in line with this policy.
It should be noted that the HTTPOnly flag is
not used on any cookies exposing them to increased greater risk of
exposure (for example through XSS) - such as
the XSS which was present on the login page for ~1 year before being
inadvertently fixed!!.
Additionally, whilst the cookies expire at the
end of a session, they are not overwritten on logout. This mean any user
who does not close their browser, even if they
log out correctly, will still have these cookies present until they
close their browser. Thus increasing the
window for exposure.
*PoC*
The
cookies holding the most sensitive information include:
* rinfo
* NewUniversalCookie
On browsing to the "Credit Cards"
section and selecting a credit card a cookie such as the following is set (credit
card number obscured):
rinfo=/EBAN_Cards_ENS/BtoChannelDriver.ssobto?dse_operationName=viewRecentTransactions&cardSelected=5***************
The sensitive information in the
NewUniversalCookie is base64 encoded, when decoded it is of the format shown
below
(sensitive data has been stripped):
<?xml version=\"1.0\"
encoding=\"ISO-8859-1\"?><cookie><definitionName>NewUserPasswordCookie</definitionName><name>*****</name><alias>*****</alias><userID>*****</userID></cook"
*Credits*
ee4f99e7e240e4ebef195678a635c0a9
*References*
Santander's Data Protection Statement:
http://tinyurl.com/santander-dpa
Santanders Cookie Policy stating "cookies
do not contain personal information, and cannot be used to identify you"
http://tinyurl.com/santanderCookies
PCI DSS v2.0:
https://www.pcisecuritystandards.org/documents/pci_dss_v2.pdf
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