Cross-site scripting in simple-markdown - CVE-2019-9844
Published: April 11, 2019
Vulnerability identifier: #VU18242
CSH Severity: Medium
CVSS v4: 5.1 [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]
CVE-ID: CVE-2019-9844
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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 a data: or vbscript: URI. 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.
Affected software
simple-markdown
Fedora
nodejs-simple-markdown
Fedora
nodejs-simple-markdown
How to mitigate CVE-2019-9844
Install update from vendor's website.
simple-markdown - update to 0.4.4
nodejs-simple-markdown - addressed in versions 0.4.4-1.fc28, 0.4.4-1.fc29, 0.4.4-1.fc30
nodejs-simple-markdown - addressed in versions 0.4.4-1.fc28, 0.4.4-1.fc29, 0.4.4-1.fc30