SB2019103039 - Cross-site scripting in SIR gnuboard5

Description

This security bulletin contains information about 1 security vulnerability.

1) Cross-site scripting (CVE-ID: CVE-2018-18678)

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 "board group extra contents" parameter, aka the adm/boardgroup_form_update.php gr_1~10 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.

Remediation

Install update from vendor's website.

References

• https://github.com/gnuboard/gnuboard5/commit/a45241f4bc46aee1ab2cc0749f6444b043681edf#diff-d87f2c71fb4fe131465ba1ff0a5d573d
• https://github.com/gnuboard/gnuboard5/compare/15b2e73...2549172
• https://github.com/gnuboard/gnuboard5/releases/tag/5.3.2.0