Cross-site scripting in SIR gnuboard5

1) Cross-site scripting

EUVDB-ID: #VU20425

Risk: Low

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:Clear]

CVE-ID: CVE-2018-18668

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

Exploit availability: No

Description

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

The vulnerability exists due to insufficient sanitization of user-supplied data when processing the "homepage title" parameter, aka the adm/config_form_update.php "cf_title" parameter. 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

gnuboard5: 5.0.1 - 5.3.1.9

CPE2.3

• cpe:2.3:a:sir:gnuboard5:5.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:sir:gnuboard5:5.0.2:*:*:*:*:*:*:*
• cpe:2.3:a:sir:gnuboard5:5.0.3:*:*:*:*:*:*:*

External links

https://github.com/gnuboard/gnuboard5/commit/a45241f4bc46aee1ab2cc0749f6444b043681edf#diff-53f7f220c2d2861a98444adf09471496
https://github.com/gnuboard/gnuboard5/compare/15b2e73...2549172
https://github.com/gnuboard/gnuboard5/releases/tag/5.3.2.0

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.