Multiple vulnerabilities in D-Link DSL-2640B
| Risk | Low |
| Patch available | NO |
| Number of vulnerabilities | 5 |
| CVE-ID | CVE-2020-9275 CVE-2020-9276 CVE-2020-9278 CVE-2020-9279 CVE-2020-9277 |
| CWE-ID | CWE-200 CWE-121 CWE-284 CWE-798 CWE-287 |
| Exploitation vector | Local network |
| Public exploit |
Public exploit code for vulnerability #1 is available. Public exploit code for vulnerability #2 is available. Public exploit code for vulnerability #3 is available. Public exploit code for vulnerability #4 is available. Public exploit code for vulnerability #5 is available. |
| Vulnerable software Subscribe |
DSL-2640B Hardware solutions / Routers & switches, VoIP, GSM, etc |
| Vendor | D-Link |
Security Bulletin
This security bulletin contains information about 5 vulnerabilities.
1) Information disclosure
EUVDB-ID: #VU27055
Risk: Low
CVSSv3.1: 6.2 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:U/RC:C]
CVE-ID: CVE-2020-9275
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to and error in a cfm UDP service listening on port 65002. A remote attacker on the local network can send a specific UDP packet and cause unauthenticated exfiltration of administrative credentials.
This vulnerability affects devices with the following versions:
- Hardware version: B2
- Firmware version: ver.4.01
Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsDSL-2640B: 4.01
External linkshttp://raelize.com/advisories/CVE-2020-9275_D-Link-DSL-2640B_Remote-Credentials-Exfiltration_v1.0.txt
http://raelize.com/posts/d-link-dsl-2640b-security-advisories/
http://www.dlink.com/en/security-bulletin
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
2) Stack-based buffer overflow
EUVDB-ID: #VU27056
Risk: Low
CVSSv3.1: 7.6 [CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C]
CVE-ID: CVE-2020-9276
CWE-ID:
CWE-121 - Stack-based buffer overflow
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the "do_cgi()" function. A remote authenticated attacker on the local network can send a specially crafted HTTP request, trigger stack-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Note: Unauthenticated exploitation is possible by combining this vulnerability with CVE-2020-9277
This vulnerability affects devices with the following versions:
- Hardware version: B2
- Firmware version: ver.4.01
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsDSL-2640B: 4.01
External linkshttp://raelize.com/advisories/CVE-2020-9276_D-Link-DSL-2640B_do_cgi-buffer-overflow_v1.0.txt
http://raelize.com/posts/d-link-dsl-2640b-security-advisories/
http://www.dlink.com/en/security-bulletin
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
3) Improper access control
EUVDB-ID: #VU27057
Risk: Low
CVSSv3.1: 8.3 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C]
CVE-ID: CVE-2020-9278
CWE-ID:
CWE-284 - Improper Access Control
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions in "rebootinfo.cgi", "ppppasswordinfo.cgi", "qosqueue.cmd?action=savReboot" and "restoreinfo.cgi" URLs. A remote attacker on the local network can access a specific URL, bypass implemented security restrictions and reset the device to its default configuration.
This vulnerability affects devices with the following versions:
- Hardware version: B2
- Firmware version: ver.4.01
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsDSL-2640B: 4.01
External linkshttp://raelize.com/advisories/CVE-2020-9278_D-Link-DSL-2640B_Unauthenticated-configuration-reset_v1.0.txt
http://raelize.com/posts/d-link-dsl-2640b-security-advisories/
http://www.dlink.com/en/security-bulletin
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
4) Use of hard-coded credentials
EUVDB-ID: #VU27058
Risk: Low
CVSSv3.1: 8.3 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C]
CVE-ID: CVE-2020-9279
CWE-ID:
CWE-798 - Use of Hard-coded Credentials
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to gain full access to vulnerable system.
The vulnerability exists due to presence of hard-coded credentials in application code in the "libpsi.so" library. A remote attacker on the local network can access the affected system using the hard-coded credentials, perform critical tasks and take full control of the device.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.This vulnerability affects devices with the following versions:
- Hardware version: B2
- Firmware version: ver.4.01
Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsDSL-2640B: 4.01
External linkshttp://raelize.com/advisories/CVE-2020-9279_D-Link-DSL-2640B_Hard-coded-privileged-account_v1.0.txt
http://raelize.com/posts/d-link-dsl-2640b-security-advisories/
http://www.dlink.com/en/security-bulletin
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
5) Improper Authentication
EUVDB-ID: #VU27059
Risk: Low
CVSSv3.1: 8.3 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C]
CVE-ID: CVE-2020-9277
CWE-ID:
CWE-287 - Improper Authentication
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error when accessing cgi modules. A remote attacker on the local network can bypass authentication process and perform administrative tasks.
This vulnerability affects devices with the following versions:- Hardware version: B2
- Firmware version: ver.4.01
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.
Vulnerable software versionsDSL-2640B: 4.01
External linkshttp://raelize.com/advisories/CVE-2020-9277_D-Link-DSL-2640B_CGI-Authentication-bypass_v1.0.txt
http://raelize.com/posts/d-link-dsl-2640b-security-advisories/
http://www.dlink.com/en/security-bulletin
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.
