PT-2022-8821 · Tenda · Tenda Ac9

Li Yuan Cheng · Published 2022-02-11 · Updated 2022-02-22 · CVE-2020-26728

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Tenda AC9 version V15.03.06.42 multi Tenda AC9 version V15.03.05.19(6318) CN

Description A vulnerability was discovered that allows for remote code execution via shell metacharacters in the guestuser field to the fastcall function with a POST request to the API endpoint.

Recommendations For Tenda AC9 version V15.03.06.42 multi, consider disabling the fastcall function until a patch is available. For Tenda AC9 version V15.03.05.19(6318) CN, avoid using the guestuser field in the affected API endpoint until the issue is resolved. As a temporary workaround, restrict access to the vulnerable module to minimize the risk of exploitation.

Exploit

Fix

Related Identifiers

CVE-2020-26728

Affected Products

Tenda Ac9

References · 7

• 🔥 https://github.com/Lyc-heng/routers/blob/a80b30bccfc9b76f3a4868ff28ad5ce2e0fca180/routers/rce1.md · Exploit
• 🔥 https://github.com/Lyc-heng/routers/blob/main/routers/rce1.md · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2020-26728 · Security Note
• https://osv.dev/vulnerability/CVE-2020-26728 · Vendor Advisory
• https://t.me/cibsecurity/37351 · Telegram Post
• ❌ https://github.com/Lyc-heng/Router/blob/main/Tenda/rce1.md · Note, Deleted
• https://t.me/cvenotify/26690 · Telegram Post