CVE-2019-19823

published 2020-01-27

CVE-2019-19823: A certain router administration interface (that includes Realtek APMIB 0.11f for Boa 0.94.14rc21) stores cleartext administrative passwords in flash memory and…

Priority P3 56 high 7.5 CVSS 3.1

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

EXPLOIT

A certain router administration interface (that includes Realtek APMIB 0.11f for Boa 0.94.14rc21) stores cleartext administrative passwords in flash memory and in a file. This affects TOTOLINK 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; Rutek RTK 11N AP through 2019-12-12; Sapido GR297n through 2019-12-12; CIK TELECOM MESH ROUTER through 2019-12-12; KCTVJEJU Wireless AP through 2019-12-12; Fibergate FGN-R2 through 2019-12-12; Hi-Wifi MAX-C300N through 2019-12-12; HCN MAX-C300N through 2019-12-12; T-broad GN-866ac through 2019-12-12; Coship EMTA AP through 2019-12-12; and IO-Data WN-AC1167R through 2019-12-12.

Affected

18 ranges

Vendor	Product	Version range	Fixed in
ciktel	mesh_router_firmware	<= 2019-12-12	—
coship	emta_ap_firmwre	<= 2019-12-12	—
fg-products	fgn-r2_firmware	<= 2019-12-12	—
hcn_max-c300n_project	hcn_max-c300n_firmware	<= 2019-12-12	—
hiwifi	max-c300n_firmware	<= 2019-12-12	—
iodata	wn-ac1167r_firmwre	<= 2019-12-12	—
kctvjeju	wireless_ap_firmware	<= 2019-12-12	—
realtek	rtk_11n_ap_firmware	<= 2019-12-12	—
sapido	gr297n_firmware	<= 2019-12-12	—
tbroad	gn-866ac_firmware	<= 2019-12-12	—
totolink	a3002ru_firmware	<= 2.0.0	—
totolink	a702r_firmware	<= 2.1.3	—
totolink	n100re_firmware	<= 3.4.0	—
totolink	n150rt_firmware	<= 3.4.0	—
totolink	n200re_firmware	<= 4.0.0	—
totolink	n300rt_firmware	<= 3.4.0	—
totolink	n301rt_firmware	<= 2.1.6	—
totolink	n302r_firmware	<= 3.4.0	—

Detection & IOCs extracted from sources · hover to see the quote

path /config.dat

url {{BaseURL}}/config.dat

other fofa-query: title="totolink"

• → Detect unauthenticated GET requests to /config.dat on Boa web server; a successful response (HTTP 200) with Content-Type: text/plain, Server header containing 'boa', and Accept-Ranges: bytes indicates exploitation of CVE-2019-19823.
• → The vulnerable administration interface runs on Boa 0.94.14rc21; look for 'boa' in the HTTP Server response header as a fingerprint for affected devices. ↗
• → Cleartext administrative passwords are stored in flash memory and exposed via the config.dat file; any successful retrieval of this file from an unauthenticated request should be treated as a confirmed credential exposure. ↗
• → Reference exploit/PoC available at PacketStorm; monitor for HTTP GET /config.dat requests against TOTOLINK/Realtek SDK-based router admin interfaces.

• · The vulnerability is unauthenticated (CWE-306 - Missing Authentication for Critical Function); no credentials are required to retrieve the full router configuration including Wi-Fi passwords and admin credentials.
• · Affected firmware versions span multiple vendors using the Realtek SDK; TOTOLINK A3002RU ≤2.0.0, A702R ≤2.1.3, N301RT ≤2.1.6, N302R ≤3.4.0, N300RT ≤3.4.0, N200RE ≤4.0.0, N150RT ≤3.4.0, N100RE ≤3.4.0, plus Rutek, Sapido, CIK TELECOM, KCTVJEJU, Fibergate, Hi-Wifi, HCN, T-broad, Coship, and IO-Data devices through 2019-12-12. ↗
• · The Nuclei template requires all four conditions simultaneously (HTTP 200, Content-Type text/plain, Server contains 'boa', Accept-Ranges bytes) to reduce false positives when scanning for this exposure.

CVSS provenance

nvd v3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd v2.0 5.0 MEDIUM AV:N/AC:L/Au:N/C:P/I:N/A:N

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