Cross-site scripting in Bleach - CVE-2020-6802

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Main Vulnerability Database Vulnerabilities #VU25729

Cross-site scripting in Bleach - CVE-2020-6802

Published: March 2, 2020 / Updated: March 26, 2020


Vulnerability identifier: #VU25729
CSH Severity: Low
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-2020-6802
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. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code via calling "bleach.clean" with "noscript" and a raw tag in the "allowed/whitelisted" tags option 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

Bleach
Debian Linux
Fedora
SUSE Linux
Opensuse
Ubuntu
py3-bleach (Alpine package)
python-bleach (Ubuntu package)
python-bleach (Debian package)
python-bleach

How to mitigate CVE-2020-6802

Install updates from vendor's website.

Bleach - update to 3.1.1
py3-bleach (Alpine package) - addressed in versions 3.1.1-r0, 3.1.4-r0
python-bleach (Ubuntu package) - addressed in versions 1.4.2-1ubuntu0.1~esm1, 2.1.2-1ubuntu0.1~esm1, 3.1.1-1ubuntu0.1~esm1
python-bleach (Debian package) - update to 3.1.1-0+deb10u1
python-bleach - addressed in versions 3.1.4-2.el8, 3.1.4-2.fc30, 3.1.4-2.fc31, 3.1.4-2.fc32

External References

Related Security Bulletins