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Deutsche Telekom CERT Advisory DTC-A-20170323-001

Deutsche Telekom CERT Advisory DTC-A-20170323-001
Posted Jul 16, 2019
Authored by Christian Kagerhuber

FRITZ!OS versions 6.83 and 6.80 (AVM DSL Router Fritz!Box 7490) suffer from an information leakage vulnerability.

tags | advisory
MD5 | 30d129eb66d1093e1254b2a78737e3f9

Deutsche Telekom CERT Advisory DTC-A-20170323-001

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Deutsche Telekom CERT Advisory [DTC-A-20170323-001]

Summary:
Information leakage found in FRITZ!OS 6.83 & 6.80 (AVM DSL Router Fritz!Box 7490)

Recommendation:
Update to the newest Version of FRITZ!OS

Details:
a) application
b) problem
c) CVSS
d) detailed description
e) credits

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

a) FRITZ!OS 6.83 & 6.80 (AVM DSL Router Fritz!Box 7490)

b) Memory leakage within the PPPoE/PPP padding

c) 4.7 CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/RL:U

d)
Multiple DSL access router (aka Homegateway / CPE) handle PPPoE frame padding incorrectly.
Instead of padding frames with zeroes, frames are padded with random memory, allowing an attacker (with physical access to wire between PPPoE endpoints) to view slices of previously transmitted packets or portions of kernel memory.
This seems to be similar to http://www.securiteam.com/securitynews/5BP01208UO.html.

AVM DSL Router Fritz!Box 7490 (tested with FRITZ!OS 6.83 & 6.80) sends portion of memory within PPPoE Discovery protocol PADT frames because arbitrary memory is used in the padding to reach the minimum Ethernet frame length.

Further research shows that “short” PPP LCP frames are also padded with random memory.

e) Christian Kagerhuber

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