VAR-201910-1479

Vulnerability from variot - Updated: 2024-11-23 21:36

Information Leakage in PPPoE Packet Padding in AVM Fritz!Box 7490 with Firmware versions Fritz!OS 6.80 and 6.83 allows physically proximate attackers to view slices of previously transmitted packets or portions of memory via via unspecified vectors. AVM Fritz!Box 7490 Contains an information disclosure vulnerability.Information may be obtained. 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. 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 \x93short\x94 PPP LCP frames are also padded with random memory.

e) Christian Kagerhuber

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