Cross-site scripting in Backdrop CMS



Published: 2020-10-01
Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE ID CVE-2020-13669
CVE-2020-13666
CWE ID CWE-79
Exploitation vector Network
Public exploit N/A
Vulnerable software
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Backdrop CMS
Web applications / CMS

Vendor Backdrop CMS

Security Advisory

1) Cross-site scripting

Risk: Medium

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] [PCI]

CVE-ID: CVE-2020-13669

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 built-in CKEditor image caption functionality. A remote attacker can 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

Backdrop CMS: 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.10.0, 1.10.1, 1.10.2, 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.11.4, 1.11.5, 1.11.6, 1.11.7, 1.11.8, 1.11.9, 1.12.0, 1.12.1, 1.12.2, 1.12.3, 1.12.4, 1.12.5, 1.12.6, 1.12.7, 1.12.8, 1.13.0, 1.13.0-preview, 1.13.1, 1.13.2, 1.13.3, 1.13.4, 1.13.5, 1.14.0, 1.14.0-preview, 1.14.1, 1.14.2, 1.14.3, 1.14.4, 1.15.0, 1.15.0-preview, 1.15.1, 1.15.2, 1.15.3, 1.15.4, 1.16.0, 1.16.0-preview, 1.16.1, 1.16.2, 1.16.3, 1.17.0

CPE External links

https://backdropcms.org/security/backdrop-sa-core-2020-006

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) Cross-site scripting

Risk: Medium

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] [PCI]

CVE-ID: CVE-2020-13666

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 AJAX API, related to JSONP processing. 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

Backdrop CMS: 1.1.0, 1.1.1, 1.1.2, 1.1.3, 1.1.4, 1.10.0, 1.10.1, 1.10.2, 1.11.0, 1.11.1, 1.11.2, 1.11.3, 1.11.4, 1.11.5, 1.11.6, 1.11.7, 1.11.8, 1.11.9, 1.12.0, 1.12.1, 1.12.2, 1.12.3, 1.12.4, 1.12.5, 1.12.6, 1.12.7, 1.12.8, 1.13.0, 1.13.0-preview, 1.13.1, 1.13.2, 1.13.3, 1.13.4, 1.13.5, 1.14.0, 1.14.0-preview, 1.14.1, 1.14.2, 1.14.3, 1.14.4, 1.15.0, 1.15.0-preview, 1.15.1, 1.15.2, 1.15.3, 1.15.4, 1.16.0, 1.16.0-preview, 1.16.1, 1.16.2, 1.16.3, 1.17.0

CPE External links

https://backdropcms.org/security/backdrop-sa-core-2020-005

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.



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