Cross-site scripting in Bleach - CVE-2020-6816
Published: March 26, 2020
Vulnerability identifier: #VU26414
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-2020-6816
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 when processing embedded MathML and SVG content with RCDATA tags. A remote attacker can 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
Bleach
Debian Linux
Ubuntu
Fedora
py3-bleach (Alpine package)
python-bleach (Ubuntu package)
python-bleach (Debian package)
python-bleach
Debian Linux
Ubuntu
Fedora
py3-bleach (Alpine package)
python-bleach (Ubuntu package)
python-bleach (Debian package)
python-bleach
How to mitigate CVE-2020-6816
Install updates from vendor's website.
Bleach - update to 3.1.2
py3-bleach (Alpine package) - update to 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 3.1.2-0+deb10u1
python-bleach - update to 3.2.1-1.fc33
py3-bleach (Alpine package) - update to 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 3.1.2-0+deb10u1
python-bleach - update to 3.2.1-1.fc33