CVE-2021-27256

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.
Configurations

Configuration 1 (hide)

AND
cpe:2.3:o:netgear:br200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:br200:-:*:*:*:*:*:*:*

Configuration 2 (hide)

AND
cpe:2.3:o:netgear:br500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:br500:-:*:*:*:*:*:*:*

Configuration 3 (hide)

AND
cpe:2.3:o:netgear:d7800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:d7800:-:*:*:*:*:*:*:*

Configuration 4 (hide)

AND
cpe:2.3:o:netgear:ex6100v2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6100v2:-:*:*:*:*:*:*:*

Configuration 5 (hide)

AND
cpe:2.3:o:netgear:ex6150v2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6150v2:-:*:*:*:*:*:*:*

Configuration 6 (hide)

AND
cpe:2.3:o:netgear:ex6250_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6250:-:*:*:*:*:*:*:*

Configuration 7 (hide)

AND
cpe:2.3:o:netgear:ex6400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6400:-:*:*:*:*:*:*:*

Configuration 8 (hide)

AND
cpe:2.3:o:netgear:ex6400v2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6400v2:-:*:*:*:*:*:*:*

Configuration 9 (hide)

AND
cpe:2.3:o:netgear:ex6410_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6410:-:*:*:*:*:*:*:*

Configuration 10 (hide)

AND
cpe:2.3:o:netgear:ex6420_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6420:-:*:*:*:*:*:*:*

Configuration 11 (hide)

AND
cpe:2.3:o:netgear:ex7300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex7300:-:*:*:*:*:*:*:*

Configuration 12 (hide)

AND
cpe:2.3:o:netgear:ex7300v2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex7300v2:-:*:*:*:*:*:*:*

Configuration 13 (hide)

AND
cpe:2.3:o:netgear:ex7320_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex7320:-:*:*:*:*:*:*:*

Configuration 14 (hide)

AND
cpe:2.3:o:netgear:ex7700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex7700:-:*:*:*:*:*:*:*

Configuration 15 (hide)

AND
cpe:2.3:o:netgear:ex8000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex8000:-:*:*:*:*:*:*:*

Configuration 16 (hide)

AND
cpe:2.3:o:netgear:lbr20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:lbr20:-:*:*:*:*:*:*:*

Configuration 17 (hide)

AND
cpe:2.3:o:netgear:r7800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r7800:-:*:*:*:*:*:*:*

Configuration 18 (hide)

AND
cpe:2.3:o:netgear:r8900_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r8900:-:*:*:*:*:*:*:*

Configuration 19 (hide)

AND
cpe:2.3:o:netgear:r9000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r9000:-:*:*:*:*:*:*:*

Configuration 20 (hide)

AND
cpe:2.3:o:netgear:rbk12_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk12:-:*:*:*:*:*:*:*

Configuration 21 (hide)

AND
cpe:2.3:o:netgear:rbk13_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk13:-:*:*:*:*:*:*:*

Configuration 22 (hide)

AND
cpe:2.3:o:netgear:rbk14_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk14:-:*:*:*:*:*:*:*

Configuration 23 (hide)

AND
cpe:2.3:o:netgear:rbk15_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk15:-:*:*:*:*:*:*:*

Configuration 24 (hide)

AND
cpe:2.3:o:netgear:rbk20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk20:-:*:*:*:*:*:*:*

Configuration 25 (hide)

AND
cpe:2.3:o:netgear:rbk23_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk23:-:*:*:*:*:*:*:*

Configuration 26 (hide)

AND
cpe:2.3:o:netgear:rbk40_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk40:-:*:*:*:*:*:*:*

Configuration 27 (hide)

AND
cpe:2.3:o:netgear:rbk43_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk43:-:*:*:*:*:*:*:*

Configuration 28 (hide)

AND
cpe:2.3:o:netgear:rbk43s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk43s:-:*:*:*:*:*:*:*

Configuration 29 (hide)

AND
cpe:2.3:o:netgear:rbk44_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk44:-:*:*:*:*:*:*:*

Configuration 30 (hide)

AND
cpe:2.3:o:netgear:rbk50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk50:-:*:*:*:*:*:*:*

Configuration 31 (hide)

AND
cpe:2.3:o:netgear:rbk53_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk53:-:*:*:*:*:*:*:*

Configuration 32 (hide)

AND
cpe:2.3:o:netgear:rbr10_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbr10:-:*:*:*:*:*:*:*

Configuration 33 (hide)

AND
cpe:2.3:o:netgear:rbr20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbr20:-:*:*:*:*:*:*:*

Configuration 34 (hide)

AND
cpe:2.3:o:netgear:rbr40_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbr40:-:*:*:*:*:*:*:*

Configuration 35 (hide)

AND
cpe:2.3:o:netgear:rbr50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbr50:-:*:*:*:*:*:*:*

Configuration 36 (hide)

AND
cpe:2.3:o:netgear:rbs10_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbs10:-:*:*:*:*:*:*:*

Configuration 37 (hide)

AND
cpe:2.3:o:netgear:rbs20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbs20:-:*:*:*:*:*:*:*

Configuration 38 (hide)

AND
cpe:2.3:o:netgear:rbs40_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbs40:-:*:*:*:*:*:*:*

Configuration 39 (hide)

AND
cpe:2.3:o:netgear:rbs50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbs50:-:*:*:*:*:*:*:*

Configuration 40 (hide)

AND
cpe:2.3:o:netgear:rbs50y_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbs50y:-:*:*:*:*:*:*:*

Configuration 41 (hide)

AND
cpe:2.3:o:netgear:xr450_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:xr450:-:*:*:*:*:*:*:*

Configuration 42 (hide)

AND
cpe:2.3:o:netgear:xr500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:xr500:-:*:*:*:*:*:*:*

Configuration 43 (hide)

AND
cpe:2.3:o:netgear:xr700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:xr700:-:*:*:*:*:*:*:*

History

16 Mar 2021, 19:35

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown
v2 : 8.3
v3 : 8.8
CPE cpe:2.3:o:netgear:ex6420_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk15_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk53_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk15:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk44:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r9000:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk40_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex6410_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex7300_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r7800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:lbr20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:xr450_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk12:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbr20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs10_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6150v2:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:d7800:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6250:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r7800:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:xr700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk14:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbr40:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk13_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk23:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex7700_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbs40:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6400v2:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbr20:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6410:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:xr500:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex7320:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6420:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbr50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:d7800_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex7320_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk43:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk50:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:xr500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbs50:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex6150v2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbr50:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs40_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex6400v2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r9000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbr10_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs50y_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6400:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbr10:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex8000_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk43s:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk50_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex6400_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbs20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk14_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk44_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex7300v2:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex8000:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex6100v2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:lbr20:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex7700:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk20:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:xr700:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk20_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:xr450:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex6100v2:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk13:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbs10:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:ex7300:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex7300v2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:br200:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:br500:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk12_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:r8900:-:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbs50y:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:r8900_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk43s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:br500_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk23_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:br200_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk40:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:ex6250_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbk53:-:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbk43_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:netgear:rbr40_firmware:*:*:*:*:*:*:*:*
cpe:2.3:h:netgear:rbs20:-:*:*:*:*:*:*:*
References (N/A) https://www.zerodayinitiative.com/advisories/ZDI-21-262/ - (N/A) https://www.zerodayinitiative.com/advisories/ZDI-21-262/ - Third Party Advisory, VDB Entry
References (N/A) https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders - (N/A) https://kb.netgear.com/000062883/Security-Advisory-for-Multiple-Vulnerabilities-on-Some-Routers-Satellites-and-Extenders - Patch, Vendor Advisory

05 Mar 2021, 21:15

Type Values Removed Values Added
Summary 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. 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.

05 Mar 2021, 20:50

Type Values Removed Values Added
New CVE

Information

Published : 2021-03-05 20:15

Updated : 2023-12-10 13:41


NVD link : CVE-2021-27256

Mitre link : CVE-2021-27256

CVE.ORG link : CVE-2021-27256


JSON object : View

Products Affected

netgear

  • rbk15
  • rbs50_firmware
  • ex8000_firmware
  • rbk12
  • rbr40_firmware
  • r7800_firmware
  • ex7320
  • ex7300
  • rbs20
  • rbr20_firmware
  • xr700_firmware
  • rbs40
  • br200
  • rbk43s
  • rbr10_firmware
  • rbs20_firmware
  • rbk14
  • rbk43s_firmware
  • rbk43_firmware
  • rbk20
  • br500
  • rbs10
  • ex6410_firmware
  • rbk43
  • br200_firmware
  • ex6420_firmware
  • ex6150v2
  • rbk40_firmware
  • ex6400_firmware
  • xr450
  • rbk40
  • xr450_firmware
  • ex6250_firmware
  • rbs10_firmware
  • r9000_firmware
  • rbk23
  • ex6420
  • ex7700_firmware
  • rbk23_firmware
  • rbs50y_firmware
  • br500_firmware
  • ex6400v2_firmware
  • ex6400v2
  • r7800
  • ex6100v2
  • ex7300v2
  • ex8000
  • xr500
  • rbs50y
  • lbr20_firmware
  • rbk13_firmware
  • ex7300_firmware
  • rbk14_firmware
  • ex6410
  • rbk20_firmware
  • rbk50_firmware
  • rbr20
  • rbs40_firmware
  • rbr50
  • d7800_firmware
  • ex6100v2_firmware
  • rbk53_firmware
  • r8900_firmware
  • rbk12_firmware
  • rbk44
  • ex6250
  • lbr20
  • rbk53
  • xr500_firmware
  • ex6150v2_firmware
  • ex7700
  • ex7300v2_firmware
  • r9000
  • rbk15_firmware
  • ex6400
  • rbk13
  • d7800
  • rbr10
  • xr700
  • rbs50
  • rbk44_firmware
  • rbr40
  • r8900
  • rbk50
  • rbr50_firmware
  • ex7320_firmware
CWE
CWE-78

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')