Linksys BEFVP41 VPN Router Can Be Crashed By Remote Users
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SecurityTracker Alert ID: 1015490 |
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SecurityTracker URL: http://securitytracker.com/id/1015490
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Jan 16 2006
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Impact:
Denial of service via network
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Exploit Included: Yes
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Version(s): BEFVP41
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Description:
A vulnerability was reported in the Linksys BEFVP41 VPN Router. A remote user can cause the router to crash.
A remote user can send a specially crafted IP packet with a null length value for IP option #0xE4 to cause the target device to crash.
The device can be crashed from the LAN-side interface. A reboot is required to return the device to normal operations.
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Impact:
A remote user can cause the target router to crash.
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Solution:
No solution was available at the time of this entry.
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Vendor URL: www.linksys.com/ (Links to External Site)
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Cause:
Exception handling error
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Message History:
None.
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Source Message Contents
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Subject: Linksys VPN Router (BEFVP41) DoS Vulnerability
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Linksys BEFVP41 (possibly others) (not sure which firmware) can be instantenously crashed by sending a specially crafted IP packet
with a null length for IP option #0xE4 , like this one:
00 0f 66 99 a3 45 00 10 5a cc 59 84 08 00 46 00
00 2c 04 d2 00 00 ff aa 06 2a c0 a8 01 65 43 08
c6 15 e4 00 00 00 41 42 43 44 45 46 47 48 49 4a
4b 4c 4d 4e 4f 50 52 53 54 55
I tried from within LAN-side of the router. Did not test WAN-side, but probably still works. Requires a reboot to fix. Found it
accidentally while doing nessus scan. (Nessus Referenced BID : 7175, 14536)
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