CVE-2019-19825A3002ru Firmware Authentication Bypass
On certain TOTOLINK Realtek SDK based routers, the CAPTCHA text can be retrieved via an {"topicurl":"setting/getSanvas"} POST to the boafrm/formLogin URI, leading to a CAPTCHA bypass.
Published Jan 27, 2020 · Updated Nov 21, 2024
Key Facts
Patch immediately- CVE-2019-19825 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting A3002ru Firmware (Totolink), A702r Firmware (Totolink), N100re Firmware (Totolink) and 5 more products.
- It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Feb 23, 2024. No public exploit code is known.
- EPSS estimates a 30% probability of exploitation in the next 30 days.
- Fixed versions are available, including A3002ru Firmware <=2.0.0, A702r Firmware <=2.1.3, N100re Firmware <=3.4.0.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
30%
Higher than 98.1% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
54/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Feb 23, 2024
1488 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
11
Reports of active use
Advisories And Exploit References
Description
On certain TOTOLINK Realtek SDK based routers, the CAPTCHA text can be retrieved via an {"topicurl":"setting/getSanvas"} POST to the boafrm/formLogin URI, leading to a CAPTCHA bypass. (Also, the CAPTCHA text is not needed once the attacker has determined valid credentials.
The attacker can perform router actions via HTTP requests with Basic Authentication.) This affects A3002RU through 2.0.0, A702R through 2.1.3, N301RT through 2.1.6, N302R through 3.4.0, N300RT through 3.4.0, N200RE through 4.0.0, N150RT through 3.4.0, and N100RE through 3.4.0.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CIRCL KEV | Feb 23, 2024 | n/a | Not reported |
| Industry KEV feed | Feb 23, 2024 | n/a | Not reported |
Affected Products
8 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| A3002ru FirmwareTotolink | See advisory | 2.0.0 |
| A702r FirmwareTotolink | See advisory | 2.1.3 |
| N100re FirmwareTotolink | See advisory | 3.4.0 |
| N150rt FirmwareTotolink | See advisory | 3.4.0 |
| N200re FirmwareTotolink | See advisory | 4.0.0 |
Patched Releases
A3002ru Firmware
<=2.0.0
A702r Firmware
<=2.1.3
N100re Firmware
<=3.4.0
N150rt Firmware
<=3.4.0
N200re Firmware
<=4.0.0
N300rt Firmware
<=3.4.0
N301rt Firmware
<=2.1.6
N302r Firmware
<=3.4.0
Timeline
Publicly disclosed
Jan 27, 2020
Added to CIRCL KEV
Feb 23, 2024
Added to Industry KEV feed
Feb 23, 2024
Last updated
Nov 21, 2024
Weakness Type
- CWE-287 Improper Authentication
References
- advisorypacketstormsecurity.com · Realtek-SDK-Information-Disclosure-Code-Executi…
- advisory20200124 Multiple vulnerabilities in TOTOLINK and other Realtek SDK based routers
- advisory20200131 Re: Multiple vulnerabilities in TOTOLINK and other Realtek SDK based routers
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
On certain TOTOLINK Realtek SDK based routers, the CAPTCHA text can be retrieved via an {"topicurl":"setting/getSanvas"} POST to the boafrm/formLogin URI, leading to a CAPTCHA bypass.
Affected: A3002ru Firmware (Totolink); A702r Firmware (Totolink); N100re Firmware (Totolink), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CIRCL KEV, Industry KEV feed since Feb 23, 2024.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including A3002ru Firmware <=2.0.0, A702r Firmware <=2.1.3, N100re Firmware <=3.4.0.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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