VAR-200212-0204

Vulnerability from variot - Updated: 2025-04-03 22:35

Netgear RM-356 and RT-338 series SOHO routers allow remote attackers to cause a denial of service (crash) via a UDP port scan, as demonstrated using nmap. RM-356 is a hardware router developed by Netgear, suitable for home or small office networks.

UDP scanning will crash RM-356 and RT-338. A cold boot is required to return to normal.

# nmap -sU 210.9.238.103 -T5

At this time, a crashdump occurred on the RM-356 console, and the information is as follows

Menu 24.2.1-System Maintenance-Information

Name: * _ netgear

Routing: IP

RAS F / W Version: V2.21 (I.03) | 3/30/2000

MODEM 1 F / W Version: V2.210-V90_2M_DLS

Country Code: 244

LAN

Ethernet Address: 00: a0: c5: e3: **: **

IP Address: 192.168.0.1

IP Mask: 255.255.255.0

DHCP: Server

CRASHDUMP ::

54f7a0: 00 54 f7 a8 00 21 e9 38 00 54 f8 10 00 21 e9 38 .T ...!. 8.T ...!. 8

54f7b0: 00 00 00 07 00 41 37 bc 00 2b 09 ca 00 00 00 00 ..... A7 .. + ......

54f7c0: 00 55 24 4c 00 2b 09 b2 00 00 00 00 00 55 24 4c .U $ L. + ....... U $ L

54f7d0: 00 00 00 05 00 00 00 00 00 21 16 24 00 57 26 04 .........!. $. W &.

54f7e0: 00 58 5e e8 00 21 16 24 00 00 26 04 00 21 16 24 .X ^ ..!. $ .. & ..!. $

54f7f0: 00 41 20 00 00 54 f8 10 00 21 ea 34 00 41 20 00 .A ..T ...!. 4.A.

54f800: 00 00 00 07 ff ff ff ff 00 54 f8 10 00 21 e6 6e ......... T ...!. N

54f810: 00 54 f8 2c 00 21 e6 6e 00 41 37 bc ff ff ff ff .T.,.!. N.A7 .....

54f820: ff ff 20 04 00 5e 2e 60 00 40 f7 20 00 54 f8 68 .. ^. `. @. .T.h

54f830: 00 21 b0 00 00 00 00 01 00 2b 09 ca ff ff ff ff.! ....... + ......

54f840: 00 00 00 07 00 2b 09 b2 00 5e 2e 60 00 00 00 00 ..... + ... ^. `...

54f850: ff ff ff ff 00 00 00 00 00 00 00 00 00 54 f9 9c ............. T ..

54f860: 00 5e 2e 60 00 00 00 00 00 54 f8 a8 00 21 a8 1a. ^. `..... T ...! ..

54f870: 00 00 00 07 ff ff ff ff 00 5e 2e 60 00 00 00 00 ......... ^. `...

54f880: 00 00 00 08 00 00 00 00 00 00 00 21 00 00 00 24 ...........! ... $

54f890: 00 00 00 00 00 54 f9 9c 00 5f ec d0 00 55 24 4c ..... T ..._... U $ L

54f8a0: 00 55 24 4c 00 5e 2e 60 00 54 f8 fc 00 23 b8 42 .U $ L. ^. `.T ... #. B

Boot Module Version: 4.40. Built at Wed Feb 23 14:00:29 2000

But TCP connect () scans normally.

It is worth noting that even if SNMP 161 / UDP is not open, the above scan will also cause a crash. Problem possible

In the filtering code. Most SOHO Netgear devices have a simple filtering mechanism. It is maintained and distributed by Netgear. Under some circumstances, a portscan of the router could cause a denial of service. It has been reported that portscanning a RM-356 with UDP causes the router to become unstable. This is usually accompanied by a crash, requiring a power cycling of the router to resume normal operation. It is also reported that this problem seems to affect port 161/UDP (SNMP) specifically. This problem has been reported to also affect the RT-338 models, and may affect others

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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.