[NEWS] Sioux Falls Federal Credit Union's E-mail Alert Program Transmits Account Numbers in Plaintext
From: support@securiteam.comDate: 09/03/01
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From: support@securiteam.com To: list@securiteam.com Subject: [NEWS] Sioux Falls Federal Credit Union's E-mail Alert Program Transmits Account Numbers in Plaintext Message-Id: <20010903191652.0A595138C0@mail.der-keiler.de> Date: Mon, 3 Sep 2001 21:16:52 +0200 (CEST)
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Sioux Falls Federal Credit Union's E-mail Alert Program Transmits Account
Numbers in Plaintext
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SUMMARY
Sioux Falls Federal Credit Union's e-mail alert allows customers to
receive a notification whenever a monthly statement is ready. The email
contains a URL that includes sensitive information about the user (his
account number). The email is not encrypted nor is the account number
encrypted or encoded to stop any direct parsing of the account number.
This poses a serious security and privacy problem for people using the
service.
DETAILS
Sioux Falls Federal Credit Union gives its clients the ability to be
alerted via e-mail when their monthly statement is available. There is a
rather severe flaw in this feature - below is an example of the e-mail
that a client using the online statement notification would receive:
---Please click on the following Link to retrieve your Credit Union Statement:
https://www.siouxfallsfcu.org/servlet/com.sos.estatements.PreLogin? UName=12345-5&Month=8&Year=2001
This is the Statement for August Have a Great Day!
---
In the link above, the 12345 is the account number of the person receiving the e-statement. The -5 is referencing the type of account which the statement is in regards to. In the example above, the 5 references that the account is savings.
The problem here is clear; the account number is clear text. Of course, the link requires you to include a password. However, considering the fact that most users the same password for everything - e-mail, e-statements, chat room SNs, etc - the requirement to use a password is little consolation. This, coupled with the fact that the individual branches for the credit union do not check for any type of identification other than a signature when making a withdrawal, makes this even more dangerous.
ADDITIONAL INFORMATION
The information has been provided by <mailto:bluejamc@netzero.net> BlueJAMC.
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