#VU52904 Cross-site scripting in TwitterServer - CVE-2020-35774

Vulnerability identifier: #VU52904

Vulnerability risk: Medium

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:Green]

CVE-ID: CVE-2020-35774

CWE-ID: CWE-79

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
TwitterServer
Web applications / Other software

Vendor: Twitter

Description

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks via the /histograms endpoint.

The vulnerability exists due to insufficient sanitization of user-supplied data via the via the /histograms endpoint to server/handler/HistogramQueryHandler.scala. 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

TwitterServer: 20.1.0 - 20.10.0

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External links
https://advisory.checkmarx.net/advisory/CX-2020-4287
https://github.com/twitter/twitter-server/commit/e0aeb87e89a6e6c711214ee2de0dd9f6e5f9cb6c
https://github.com/twitter/twitter-server/compare/twitter-server-20.10.0...twitter-server-20.12.0

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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.