Multiple vulnerabilities in Pi-hole



Published: 2021-02-23
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2020-35592
CVE-2020-35591
CWE-ID CWE-79
CWE-384
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Public exploit code for vulnerability #2 is available.
Vulnerable software
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Pi-hole
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Vendor Pi-hole

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Cross-site scripting

EUVDB-ID: #VU50876

Risk: Low

CVSSv3.1: 5.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-35592

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data within the Options header in the admin/ URI. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Pi-hole: 5.0, 5.1, 5.1.1

CPE2.3 External links

http://discourse.pi-hole.net/c/announcements/5
http://n4nj0.github.io/advisories/pi-hole-multiple-vulnerabilities-i/

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) Session Fixation

EUVDB-ID: #VU50877

Risk: Medium

CVSSv3.1: 4.9 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-35591

CWE-ID: CWE-384 - Session Fixation

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to the failure to generate a new session cookie after the user is logged in. A remote attacker can trick a victim to visit a specially crafted website and gain access to another user's session.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Pi-hole: 5.0, 5.1, 5.1.1

CPE2.3 External links

http://discourse.pi-hole.net/c/announcements/5
http://n4nj0.github.io/advisories/pi-hole-multiple-vulnerabilities-i/

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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