Multiple vulnerabilities in WordPress

1) Cross-site scripting

EUVDB-ID: #VU48035

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-28034

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 passed via global variables. 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

WordPress: 5.5 - 5.5.1

CPE2.3

• cpe:2.3:a:wordpress_org:wordpress:5.5.1:*:*:*:*:*:*:*

External links

https://wordpress.org/news/2020/10/wordpress-5-5-2-security-and-maintenance-release/

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.

2) Security restrictions bypass

EUVDB-ID: #VU48036

Risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-28035

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions on XML-RPC requests. A remote authenticated attacker can escalate privileges within the application by sending a specially crafted XML-RPC request.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WordPress: 3.7 - 5.5.1

CPE2.3

• cpe:2.3:a:wordpress_org:wordpress:3.7.34:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.8.34:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:3.9.32:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:4.0.31:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:4.1.31:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:4.2.28:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:4.3.24:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:4.4.23:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:4.5.22:*:*:*:*:*:*:*
• cpe:2.3:a:wordpress_org:wordpress:4.6.19:*:*:*:*:*:*:*

External links

https://wordpress.org/news/2020/10/wordpress-5-5-2-security-and-maintenance-release/

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.

3) Resource management error

EUVDB-ID: #VU48037

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-2020-28037

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise the affected website.

The vulnerability exists due to is_blog_installed in wp-includes/functions.php does not properly determine whether WordPress is already installed. This might allow an attacker to perform a new installation, leading to remote code execution (as well as a denial of service for the old installation).

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WordPress: 5.5 - 5.5.1

CPE2.3

• cpe:2.3:a:wordpress_org:wordpress:5.5.1:*:*:*:*:*:*:*

External links

https://wordpress.org/news/2020/10/wordpress-5-5-2-security-and-maintenance-release/

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) Stored cross-site scripting

EUVDB-ID: #VU48038

Risk: Low

CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear]

CVE-ID: CVE-2020-28038

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

Exploit availability: Yes

Description

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

The vulnerability exists due to insufficient sanitization of user-supplied data, related to post slugs. A remote user can permanently store 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

WordPress: 5.5 - 5.5.1

CPE2.3

• cpe:2.3:a:wordpress_org:wordpress:5.5.1:*:*:*:*:*:*:*

External links

https://wordpress.org/news/2020/10/wordpress-5-5-2-security-and-maintenance-release/

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.

5) Improper access control

EUVDB-ID: #VU48039

Risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-28039

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to delete arbitrary files.

The vulnerability exists due to improper access restrictions in is_protected_meta in wp-includes/meta.php. A remote attacker can bypass implemented security restrictions and delete arbitrary files.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WordPress: 5.5 - 5.5.1

CPE2.3

• cpe:2.3:a:wordpress_org:wordpress:5.5.1:*:*:*:*:*:*:*

External links

https://wordpress.org/news/2020/10/wordpress-5-5-2-security-and-maintenance-release/

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) Cross-site request forgery

EUVDB-ID: #VU48040

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-28040

CWE-ID: CWE-352 - Cross-Site Request Forgery (CSRF)

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform cross-site request forgery attacks.

The vulnerability exists due to insufficient validation of the HTTP request origin. A remote attacker can trick the victim to visit a specially crafted web page and perform arbitrary actions on behalf of the victim on the vulnerable website, such as change a theme's background image.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WordPress: 5.5 - 5.5.1

CPE2.3

• cpe:2.3:a:wordpress_org:wordpress:5.5.1:*:*:*:*:*:*:*

External links

https://wordpress.org/news/2020/10/wordpress-5-5-2-security-and-maintenance-release/

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.

7) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU48201

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-28033

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

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to application mishandles embeds from disabled sites on a multisite network. A remote attacker can send out spam.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WordPress: 5.5 - 5.5.1

CPE2.3

• cpe:2.3:a:wordpress_org:wordpress:5.5.1:*:*:*:*:*:*:*

External links

https://wordpress.org/news/2020/10/wordpress-5-5-2-security-and-maintenance-release/

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.

8) Deserialization of Untrusted Data

EUVDB-ID: #VU48200

Risk: High

CVSSv4.0: 8.9 [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:P/U:Amber]

CVE-ID: CVE-2020-28032

CWE-ID: CWE-502 - Deserialization of Untrusted Data

Exploit availability: Yes

Description

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

The vulnerability exists due to insecure input validation when processing serialized data in wp-includes/Requests/Utility/FilteredIterator.php. A remote attacker can pass specially crafted data to the application and execute arbitrary code on the target system.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WordPress: 5.5 - 5.5.1

CPE2.3

• cpe:2.3:a:wordpress_org:wordpress:5.5.1:*:*:*:*:*:*:*

External links

https://github.com/WordPress/wordpress-develop/commit/add6bedf3a53b647d0ebda2970057912d3cd79d3
https://wordpress.org/news/2020/10/wordpress-5-5-2-security-and-maintenance-release/

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.

9) Improper access control

EUVDB-ID: #VU48202

Risk: High

CVSSv4.0: 8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-28036

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 improper access restrictions in wp-includes/class-wp-xmlrpc-server.php. A remote attacker can bypass implemented security restrictions and gain unauthorized access to the application by using XML-RPC to comment on a post.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

WordPress: 5.5 - 5.5.1

CPE2.3

• cpe:2.3:a:wordpress_org:wordpress:5.5.1:*:*:*:*:*:*:*

External links

https://github.com/WordPress/wordpress-develop/commit/c9e6b98968025b1629015998d12c3102165a7d32
https://wordpress.org/news/2020/10/wordpress-5-5-2-security-and-maintenance-release/

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.