CVE-2020-27866

Description

This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of NETGEAR R6020, R6080, R6120, R6220, R6260, R6700v2, R6800, R6900v2, R7450, JNR3210, WNR2020, Nighthawk AC2100, and Nighthawk AC2400 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the mini_httpd service, which listens on TCP port 80 by default. The issue results from incorrect string matching logic when accessing protected pages. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root. Was ZDI-CAN-11355.

Related CPE's

onetgearac2100_firmware********

hnetgearac2100-*******

onetgearac2400_firmware********

hnetgearac2400-*******

onetgearac2600_firmware********

hnetgearac2600-*******

onetgearr6700_firmware********

hnetgearr6700v2*******

onetgearr6800_firmware********

hnetgearr6800-*******

References

https://kb.netgear.com/000062641/Security-Advisory-for-Password-Recovery-Vulnerabilities-on-Some-Routers

Vendor Advisory

https://www.zerodayinitiative.com/advisories/ZDI-20-1451/

Third Party AdvisoryVDB Entry

CvssV3 impact

BaseSeverity

HIGH

ConfidentialityImpact

HIGH

AttackComplexity

LOW

Scope

UNCHANGED

AttackVector

ADJACENT_NETWORK

AvailabilityImpact

HIGH

IntegrityImpact

HIGH

PrivilegesRequired

NONE

BaseScore

8.8

VectorString

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Version

3.1

UserInteraction

NONE

CvssV2 impact

AccessComplexity

LOW

ConfidentialityImpact

COMPLETE

AvailabilityImpact

COMPLETE

IntegrityImpact

COMPLETE

BaseScore

8.300000190734863

VectorString

AV:A/AC:L/Au:N/C:C/I:C/A:C

Version

2.0

AccessVector

ADJACENT_NETWORK

Authentication

NONE

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