Multiple vulnerabilities in Discourse

Published: 2023-11-13

Risk	Medium
Patch available	YES
Number of vulnerabilities	6
CVE-ID	CVE-2023-45806 CVE-2023-45816 CVE-2023-46130 CVE-2023-47119 CVE-2023-47120 CVE-2023-47121
CWE-ID	CWE-20 CWE-200 CWE-284 CWE-79 CWE-918
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Discourse Web applications / Forum & blogging software
Vendor	Civilized Discourse Construction Kit, Inc.

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Input validation error

EUVDB-ID: #VU83016

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-45806

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to regexp injection issue in Full Name. A remote user can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Discourse: 3.0 beta - 3.2.0 beta2

CPE2.3

External links

http://github.com/discourse/discourse/security/advisories/GHSA-hcgf-hg2g-mw78
http://github.com/discourse/discourse/commit/2ec25105179199cf80912bf011c18b8b870e1863
http://github.com/discourse/discourse/commit/7d484864fe91ff79c478f57e7ddb1235d701921e

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Information disclosure

EUVDB-ID: #VU83021

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-45816

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a local attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application. A local attacker can gain access to unread bookmark reminder notifications.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Discourse: 3.0 beta - 3.2.0 beta2

CPE2.3

External links

http://github.com/discourse/discourse/security/advisories/GHSA-v9r6-92wp-f6cf
http://github.com/discourse/discourse/commit/2c45b949ea0e9d6fa8e5af2dd07f6521ede08bf1
http://github.com/discourse/discourse/commit/3c5fb871c0f54af47679ae71ad449666b01d8216

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.

3) Improper access control

EUVDB-ID: #VU83020

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-46130

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to height value bypass in some theme components. A remote user can add svgs with unlimited height attributes and affect the availability of subsequent replies in a topic.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Discourse: 3.0 beta - 3.2.0 beta2

CPE2.3

External links

http://github.com/discourse/discourse/security/advisories/GHSA-c876-638r-vfcg
http://github.com/discourse/discourse/commit/6183d9633de873ac2b1e9cdb6ac1c94b4ffae9cb
http://github.com/discourse/discourse/commit/89a2e60706ce22e4afc463d03af2f34c53291800

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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

4) Cross-site scripting

EUVDB-ID: #VU83019

Risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-47119

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 in oneboxed links. 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 updates from vendor's website.

Vulnerable software versions

Discourse: 3.0 beta - 3.2.0 beta2

CPE2.3

External links

http://github.com/discourse/discourse/security/advisories/GHSA-j95w-5hvx-jp5w
http://github.com/discourse/discourse/commit/628b293ff53fb617b3464dd27268aec84388cc09
http://github.com/discourse/discourse/commit/d78357917c6a917a8a27af68756228e89c69321c

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.

5) Input validation error

EUVDB-ID: #VU83018

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-47120

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input within the Onebox favicon URL. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Discourse: 3.1.0 - 3.2.0 beta2

CPE2.3

External links

http://github.com/discourse/discourse/security/advisories/GHSA-77cw-xhj8-hfp3
http://github.com/discourse/discourse/commit/95a82d608d6377faf68a0e2c5d9640b043557852
http://github.com/discourse/discourse/commit/e910dd09140cb4abc3a563b95af4a137ca7fa0ce

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.

6) Server-Side Request Forgery (SSRF)

EUVDB-ID: #VU83017

Risk: Medium

CVSSv3.1: 4.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-47121

CWE-ID: CWE-918 - Server-Side Request Forgery (SSRF)

Exploit availability: No

Description

The disclosed vulnerability allows a remote attacker to perform SSRF attacks.

The vulnerability exists due to insufficient validation of user-supplied input in Embedding. A remote attacker can send a specially crafted HTTP request and trick the application to initiate requests to arbitrary systems.

Successful exploitation of this vulnerability may allow a remote attacker gain access to sensitive data, located in the local network or send malicious requests to other servers from the vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Discourse: 3.0 beta - 3.2.0 beta2

CPE2.3

External links

http://github.com/discourse/discourse/security/advisories/GHSA-hp24-94qf-8cgc
http://github.com/discourse/discourse/commit/24cca10da731734af4e9748de99a508d586e59f1
http://github.com/discourse/discourse/commit/5f20748e402223b265e6fee381472c14e2604da6

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.