Cross-site scripting in Python lxml module



Published: 2020-12-06
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-27783
CWE-ID CWE-79
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		lxml
Universal components / Libraries / Programming Languages & Components

Vendor freddix

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Cross-site scripting

EUVDB-ID: #VU48793

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2020-27783

CWE-ID:

Exploit availability:

Description

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 within lxml Python clean module. 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 updates from vendor's website.

Vulnerable software versions

lxml: 1.2 - 4.6.1

Fixed software versions

CPE2.3 External links

http://bugzilla.redhat.com/show_bug.cgi?id=1901633
http://github.com/lxml/lxml/commit/89e7aad6e7ff9ecd88678ff25f885988b184b26e
http://github.com/lxml/lxml/commit/a105ab8dc262ec6735977c25c13f0bdfcdec72a7


Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?



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