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Realtek SDK Information Disclosure / Code Execution Exploit
Author
Risk
[Security Risk Critical
]0day-ID
Category
Date add
CVE
Platform
1 Sensitive data disclosure and incorrect access control in several series
of Realtek SDK based routers
══════════════════════════════════════════════════════════════════════════
CVE: CVE-2019-19822
SDK vendor: Realtek
Device vendor: TOTOLINK, Sapido, CIK Telecom, Fibergate Inc.,
MAX-C300N, T-BROAD and possibly others..
Product: Realtek SDK based routers backed by Boa HTTP server (and
possibly others) and using apmib library for memory management.
Boa Version: <= Boa/0.94.14rc21 SDK Version: < 2020/02/15
Description: Realtek SDK based routers which use form based instead
HTTP Basic authentication (that includes Realtek APMIB 0.11f and Boa
HTTP server 0.94.14rc21) allows remote attackers to retrieve the
configuration, including sensitive data (usernames and passwords).
This affects:
• TOTOLINK A3002RU through 2.0.0,
• TOTOLINK 702R through 2.1.3,
• TOTOLINK N301RT through 2.1.6,
• TOTOLINK N302R through 3.4.0,
• TOTOLINK N300RT through 3.4.0,
• TOTOLINK N200RE through 4.0.0,
• TOTOLINK N150RT through 3.4.0, and
• TOTOLINK 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; and
• possibly others.
Technical details: The apmib library at some point of initialization
dumps the whole memory contents the file /web/config.dat. This folder
is actually used by the boa http server as index directory.
Additionally if the router is configured for form-based authentication
the access control verifies credentials only for some URLs but ".dat"
files are not restricted. This issue does not affect routers which use
HTTP Basic authentication to secure all URLs.
PoC:
┌────
│ $ curl http://routerip/config.dat
└────
2 Password stored in plaintext in Realtek SDK based routers
═══════════════════════════════════════════════════════════
CVE: CVE-2019-19823
SDK vendor: Realtek
Device vendor: TOTOLINK, Sapido, CIK Telecom, Fibergate Inc.,
MAX-C300N, T-BROAD and possibly others..
Product: Realtek SDK based routers backed by Boa HTTP server (and
possibly others) and using apmib library for memory management.
Boa Version: <= Boa/0.94.14rc21 SDK Version: < 2020/02/15
Description: Realtek SDK based routers (that includes Realtek APMIB
0.11f and Boa HTTP server 0.94.14rc21) store passwords in plaintext.
This affects:
• TOTOLINK A3002RU through 2.0.0,
• TOTOLINK 702R through 2.1.3,
• TOTOLINK N301RT through 2.1.6,
• TOTOLINK N302R through 3.4.0,
• TOTOLINK N300RT through 3.4.0,
• TOTOLINK N200RE through 4.0.0,
• TOTOLINK N150RT through 3.4.0, and
• TOTOLINK 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; and
• possibly others.
Technical details: Data stored in memory in COMPCS (apmib library)
format contains device administration and other passwords in
plaintext. The apmib library additionally at some point of
initialization dumps the whole memory contents the file
/web/config.dat which might be used to easily retrieve user passwords.
3 Code execution in several TOTOLINK routers
════════════════════════════════════════════
CVE: CVE-2019-19824
Vendor: TOTOLINK
Product: TOTOLINK Realtek SDK based routers
Boa Version: <= Boa/0.94.14rc21
Description: On several Realted SDK based TOTOLINK routers, an
authenticated attacker may execute arbitrary OS commands via the
sysCmd parameter to the boafrm/formSysCmd URI, even if the GUI
(syscmd.htm) is not available. This allows for full control over the
device's internals.
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,
• N100RE through 3.4.0, and
• possibly others.
PoC:
┌────
│ $ curl 'http://routerip/boafrm/formSysCmd' --user "admin:password"
│ --data 'submit-url=%2Fsyscmd.htm&sysCmdselect=5&sysCmdselects=0&
│ save_apply=Run+Command&sysCmd=cp%20%2Fetc%2Fpasswd%20%2Fweb%2Fxxxx.dat'
└────
4 Incorrectly implemented captcha protection in TOTOLINK routers
════════════════════════════════════════════════════════════════
CVE: CVE-2019-19825
Vendor: TOTOLINK
Product: TOTOLINK Realtek SDK based routers
Boa Version: <= Boa/0.94.14rc21
Description: Guessable captcha vulnerability (CWE-804) in several
series of TOTOLINK routers allows a remote attacker to automatically
login to the router without reading and providing real captcha.
The following command returns captcha in plain text:
┌────
│ $ curl 'http://routerip/boafrm/formLogin' --data '{"topicurl":"setting/getSanvas"}'
└────
Additionally by using the HTTP Basic in a HEADER the attacker can
execute router actions without providing captcha at all.
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,
• N100RE through 3.4.0, and
• possibly others.
5 Exploiting all together on TOTOLINK routers
═════════════════════════════════════════════
CVSS v3 socre: 9.6 AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (assuming
Administrative Access on WAN is enabled the score is 10.0)
Exploiting all the vulnerabilities together allows a remote
unauthenticated attacker to execute any code with root permissions and
reveal administration password.
The only thing that is needed is the access to router administration
interface (either access to local network or Administrative Access on
WAN enabled)
Description, video and possibly an exploit:
https://sploit.tech/2019/12/16/Realtek-TOTOLINK.html
# 0day.today [2024-11-14] #