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TenableCVE-2021-20156

HistoryDec 30, 2021 - 10:15 p.m.

CVE-2021-20156

2021-12-3022:15:08

CWE-347

tenable

web.nvd.nist.gov

cve-2021-20156

trendnet

ac2600

tew-827dru

firmware update

access control

malicious

signature validation

update server

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

6.3

Confidence

High

EPSS

0.001

Percentile

22.7%

JSON

Trendnet AC2600 TEW-827DRU version 2.08B01 contains an improper access control configuration that could allow for a malicious firmware update. It is possible to manually install firmware that may be malicious in nature as there does not appear to be any signature validation done to determine if it is from a known and trusted source. This includes firmware updates that are done via the automated “check for updates” in the admin interface. If an attacker is able to masquerade as the update server, the device will not verify that the firmware updates downloaded are legitimate.

Affected configurations

Nvd

Node

trendnettew-827dru_firmwareMatch2.08b01

AND

trendnettew-827druMatch2.0

VendorProductVersionCPE
trendnettew-827dru_firmware2.08b01cpe:2.3:o:trendnet:tew-827dru_firmware:2.08b01:*:*:*:*:*:*:*
trendnettew-827dru2.0cpe:2.3:h:trendnet:tew-827dru:2.0:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
trendnet	tew-827dru_firmware	2.08b01	cpe:2.3:o:trendnet:tew-827dru_firmware:2.08b01:::::::*
trendnet	tew-827dru	2.0	cpe:2.3:h:trendnet:tew-827dru:2.0:::::::*

CNA Affected

[
  {
    "product": "Trendnet AC2600 TEW-827DRU",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "2.08B01"
      }
    ]
  }
]

References

www.tenable.com/security/research/tra-2021-54

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

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

CVSS3

6.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

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

AI Score

6.3

Confidence

High

EPSS

0.001

Percentile

22.7%

JSON

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