JVN#21636825
A-Stage SCT-40CM01SR and AT-40CM01SR vulnerable to authentication bypass
Overview
SCT-40CM01SR and AT-40CM01SR provided by A-Stage Inc. contain an authentication bypass vulnerability.
Products Affected
- SCT-40CM01SR and AT-40CM01SR
Description
SCT-40CM01SR and AT-40CM01SR provided by A-Stage Inc. are liquid crystal televisions. SCT-40CM01SR and AT-40CM01SR contain an authentication bypass vulnerability (CWE-287).
Impact
An attacker who can access the device may log in via telnet without authentication and execute an arbitrary command.
According to the developer, even if an arbitrary command is executed, programs regarding the functions of the products can not be altered or deleted.
Solution
Update the firmware
Update the firmware to the latest version according to the information provided by the developer.
According to the developer, the update requires a repair support by the developer. For more information, contact the developer.
References
JPCERT/CC Addendum
Vulnerability Analysis by JPCERT/CC
| Attack Vector(AV) | Physical (P) | Local (L) | Adjacent (A) | Network (N) |
|---|---|---|---|---|
| Attack Complexity(AC) | High (H) | Low (L) | ||
| Privileges Required(PR) | High (H) | Low (L) | None (N) | |
| User Interaction(UI) | Required (R) | None (N) | ||
| Scope(S) | Unchanged (U) | Changed (C) | ||
| Confidentiality Impact(C) | None (N) | Low (L) | High (H) | |
| Integrity Impact(I) | None (N) | Low (L) | High (H) | |
| Availability Impact(A) | None (N) | Low (L) | High (H) |
| Access Vector(AV) | Local (L) | Adjacent Network (A) | Network (N) |
|---|---|---|---|
| Access Complexity(AC) | High (H) | Medium (M) | Low (L) |
| Authentication(Au) | Multiple (M) | Single (S) | None (N) |
| Confidentiality Impact(C) | None (N) | Partial (P) | Complete (C) |
| Integrity Impact(I) | None (N) | Partial (P) | Complete (C) |
| Availability Impact(A) | None (N) | Partial (P) | Complete (C) |
Credit
Shinnosuke Tokusho reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
Other Information
| JPCERT Alert |
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| JPCERT Reports |
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| CERT Advisory |
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| CPNI Advisory |
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| TRnotes |
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| CVE |
CVE-2021-20776 |
| JVN iPedia |
JVNDB-2021-000061 |