#VU12562 Cross-site scripting in Shaarli - CVE-2018-1046

Vulnerability identifier: #VU12562

Vulnerability 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-2018-1046

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Shaarli
Web applications / Forum & blogging software

Vendor: Shaarli

Description

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

The weakness exists in the ban_canLogin function in index.php due to insufficient sanitization of user-supplied data. 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
Update to versions 0.8.5 or 0.9.3.

Vulnerable software versions

Shaarli: 0.8.0 - 0.9.2

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External links
https://github.com/shaarli/Shaarli/pull/1046

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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.