CVE-2021-27256

HIGH

8.8

Description

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of NETGEAR R7800 firmware version 1.0.2.76. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed. The specific flaw exists within the handling of the rc_service parameter provided to apply_save.cgi. The issue results from the lack of proper validation of a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of root. Was ZDI-CAN-12355.

CVE Details

CVSS v3.1 Score8.8

SeverityHIGH

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

Attack VectorADJACENT_NETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/5/2021

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

netgear:br200netgear:br200_firmwarenetgear:br500netgear:br500_firmwarenetgear:d7800netgear:d7800_firmwarenetgear:ex6100v2netgear:ex6100v2_firmwarenetgear:ex6150v2netgear:ex6150v2_firmwarenetgear:ex6250netgear:ex6250_firmwarenetgear:ex6400netgear:ex6400_firmwarenetgear:ex6400v2netgear:ex6400v2_firmwarenetgear:ex6410netgear:ex6410_firmwarenetgear:ex6420netgear:ex6420_firmwarenetgear:ex7300netgear:ex7300_firmwarenetgear:ex7300v2netgear:ex7300v2_firmwarenetgear:ex7320netgear:ex7320_firmwarenetgear:ex7700netgear:ex7700_firmwarenetgear:ex8000netgear:ex8000_firmwarenetgear:lbr20netgear:lbr20_firmwarenetgear:r7800netgear:r7800_firmwarenetgear:r8900netgear:r8900_firmwarenetgear:r9000netgear:r9000_firmwarenetgear:rbk12netgear:rbk12_firmwarenetgear:rbk13netgear:rbk13_firmwarenetgear:rbk14netgear:rbk14_firmwarenetgear:rbk15netgear:rbk15_firmwarenetgear:rbk20netgear:rbk20_firmwarenetgear:rbk23netgear:rbk23_firmwarenetgear:rbk40netgear:rbk40_firmwarenetgear:rbk43netgear:rbk43_firmwarenetgear:rbk43snetgear:rbk43s_firmwarenetgear:rbk44netgear:rbk44_firmwarenetgear:rbk50netgear:rbk50_firmwarenetgear:rbk53netgear:rbk53_firmwarenetgear:rbr10netgear:rbr10_firmwarenetgear:rbr20netgear:rbr20_firmwarenetgear:rbr40netgear:rbr40_firmwarenetgear:rbr50netgear:rbr50_firmwarenetgear:rbs10netgear:rbs10_firmwarenetgear:rbs20netgear:rbs20_firmwarenetgear:rbs40netgear:rbs40_firmwarenetgear:rbs50netgear:rbs50_firmwarenetgear:rbs50ynetgear:rbs50y_firmwarenetgear:xr450netgear:xr450_firmwarenetgear:xr500netgear:xr500_firmwarenetgear:xr700netgear:xr700_firmware

Weaknesses (CWE)

CWE-78

References

https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders(zdi-disclosures@trendmicro.com)

https://www.zerodayinitiative.com/advisories/ZDI-21-262/(zdi-disclosures@trendmicro.com)

https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders(af854a3a-2127-422b-91ae-364da2661108)

https://www.zerodayinitiative.com/advisories/ZDI-21-262/(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.