PT-2021-17603 · Tenda · Tenda G3+2

Jinwen Zhou + 1 · Published 2021-04-15 · Updated 2022-07-12 · CVE-2021-27691

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions: Tenda G0 routers versions v15.11.0.5(5876) CN through v15.11.0.6(9039) CN Tenda G1 and G3 routers versions v15.11.0.16(9024) CN through v15.11.0.17(9502) CN

Description: The issue allows remote attackers to execute arbitrary OS commands via a crafted "action/setDebugCfg" request. This occurs because the formSetDebugCfg function executes glibc's system function with untrusted input.

Recommendations: For Tenda G0 routers versions v15.11.0.5(5876) CN through v15.11.0.6(9039) CN, consider disabling the formSetDebugCfg function until a patch is available. For Tenda G1 and G3 routers versions v15.11.0.16(9024) CN through v15.11.0.17(9502) CN, restrict access to the "action/setDebugCfg" request to minimize the risk of exploitation.

Exploit

Fix

Buffer Overflow

OS Command Injection

Weakness Enumeration

CWE-119

CWE-78

Related Identifiers

CVE-2021-27691

Affected Products

Tenda G0

Tenda G1

Tenda G3

References · 4

• 🔥 https://hackmd.io/@aZYpdinUS2SD-yhAeHwOkw/rkhTCGzMd · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2021-27691 · Security Note
• https://osv.dev/vulnerability/CVE-2021-27691 · Vendor Advisory
• https://hackmd.io/%40aZYpdinUS2SD-yhAeHwOkw/rkhTCGzMd · Note