Multiple vulnerabilities in CUJO Smart Firewall



Risk High
Patch available NO
Number of vulnerabilities 6
CVE-ID CVE-2018-4030
CVE-2018-4011
CVE-2018-3985
CVE-2018-3969
CVE-2018-3963
CVE-2018-4003
CWE-ID CWE-444
CWE-191
CWE-415
CWE-264
CWE-77
CWE-122
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Public exploit code for vulnerability #2 is available.
Public exploit code for vulnerability #4 is available.
Public exploit code for vulnerability #5 is available.
Public exploit code for vulnerability #6 is available.
Vulnerable software
 CUJO Smart Firewall
Client/Desktop applications / Antivirus software/Personal firewalls

Vendor CUJO AI

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU21163

Risk: High

CVSSv4.0: 7.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2018-4030

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

The vulnerability allows a remote attacker to conduct an HTTP request smuggling attack on the target system.

The vulnerability exists due to the way the "safe browsing" function parses HTTP requests. A remote attacker can send a specially crafted HTTP request to the application, which incorrectly extracts the "Host" header from captured HTTP, allowing visit any malicious websites and bypass the firewall.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

CUJO Smart Firewall: 7003

CPE2.3 External links

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0702


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

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) Integer underflow

EUVDB-ID: #VU21162

Risk: High

CVSSv4.0: 7.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2018-4011

CWE-ID: CWE-191 - Integer underflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists because of integer underflow in the "mdnscap" binary when parsing SRV records in an mDNS packet due to the "RDLENGTH" value is handled incorrectly. A remote attacker can send a specially crafted mDNS message to the affected application, trigger integer underflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

CUJO Smart Firewall: 7003

CPE2.3 External links

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0681


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

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) Double Free

EUVDB-ID: #VU21161

Risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-3985

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the "mdnscap" binary when parsing mDNS packets. A remote attacker can send a specially crafted mDNS message, trigger double free error and execute arbitrary code in the context of the "mdnscap" process.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

CUJO Smart Firewall: 7003

CPE2.3 External links

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0653


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

4) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU21160

Risk: Low

CVSSv4.0: 7.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear]

CVE-ID: CVE-2018-3969

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to insufficient permission restrictions in the verified boot protection. A local user who is able to write into "/config/dhcpd.conf" can add arbitrary shell commands into the "dhcpd.conf" file and execute arbitrary commands on the target system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

CUJO Smart Firewall: 7003

CPE2.3 External links

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0634


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

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) Command Injection

EUVDB-ID: #VU21159

Risk: Medium

CVSSv4.0: 7.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2018-3963

CWE-ID: CWE-77 - Command injection

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary commands on the target system.

The vulnerability exists due to insufficient validation of user-supplied input in the DHCP daemon configuration. A local authenticated user can send a DHCP request message, set up the corresponding static DHCP entry and execute arbitrary system commands on the target system.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

CUJO Smart Firewall: 7003

CPE2.3 External links

https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0627


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

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.

6) Heap-based buffer overflow

EUVDB-ID: #VU19605

Risk: High

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2018-4003

CWE-ID: CWE-122 - Heap-based Buffer Overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error in the mdnscap binary. A remote attacker can send a specially crafted mDNS message, trigger heap-based buffer overflow and execute arbitrary code on the target system.


Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

CUJO Smart Firewall: 7003

CPE2.3 External links

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0672


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

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.



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