CVE-2020-27783: XSS
First published: Sun Oct 18 2020(Updated: )
A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/python-lxml | <0:4.2.3-2.el8 | 0:4.2.3-2.el8 |
| redhat/rh-python38-babel | <0:2.7.0-12.el7 | 0:2.7.0-12.el7 |
| redhat/rh-python38-python | <0:3.8.11-2.el7 | 0:3.8.11-2.el7 |
| redhat/rh-python38-python-cryptography | <0:2.8-5.el7 | 0:2.8-5.el7 |
| redhat/rh-python38-python-jinja2 | <0:2.10.3-6.el7 | 0:2.10.3-6.el7 |
| redhat/rh-python38-python-lxml | <0:4.4.1-7.el7 | 0:4.4.1-7.el7 |
| redhat/rh-python38-python-pip | <0:19.3.1-2.el7 | 0:19.3.1-2.el7 |
| redhat/rh-python38-python-urllib3 | <0:1.25.7-7.el7 | 0:1.25.7-7.el7 |
| redhat/lxml | <4.6.2 | 4.6.2 |
| Lxml Lxml | >=1.2<4.6.2 | |
| Redhat Software Collections | ||
| Redhat Enterprise Linux | =8.0 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| Netapp Snapcenter | ||
| Oracle Communications Offline Mediation Controller | =12.0.0.3.0 | |
| Oracle ZFS Storage Appliance Kit | =8.8 | |
| pip/lxml | <4.6.2 | 4.6.2 |
| IBM Cloud Pak for Security (CP4S) | <=1.7.2.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.7.1.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.7.0.0 | |
| debian/lxml | 4.3.2-1+deb10u4 4.6.3+dfsg-0.1+deb11u1 4.9.2-1 4.9.3-1 |
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Reference Links
- https://nvd.nist.gov/vuln/detail/CVE-2020-27783
- https://github.com/lxml/lxml/commit/a105ab8dc262ec6735977c25c13f0bdfcdec72a7
- https://bugzilla.redhat.com/show_bug.cgi?id=1901633
- https://lists.debian.org/debian-lts-announce/2020/12/msg00028.html
- https://pypi.org/project/lxml/
- https://snyk.io/vuln/SNYK-PYTHON-LXML-1047473
- https://www.debian.org/security/2020/dsa-4810
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JKG67GPGTV23KADT4D4GK4RMHSO4CIQL/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TMHVKRUT22LVWNL3TB7HPSDHJT74Q3JK/
- https://advisory.checkmarx.net/advisory/CX-2020-4286
- https://security.netapp.com/advisory/ntap-20210521-0003/
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://github.com/advisories/GHSA-pgww-xf46-h92r (Advisory)
- https://exchange.xforce.ibmcloud.com/vulnerabilities/192644
- https://www.ibm.com/support/pages/node/6493729 (Advisory)
- https://pypi.org/project/lxml/4.6.1/
- https://pypi.org/project/lxml/4.6.2/
- https://github.com/lxml/lxml/commit/89e7aad6e7ff9ecd88678ff25f885988b184b26e
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1901634
- https://access.redhat.com/security/cve/CVE-2020-27783
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1901633#c0
- https://access.redhat.com/security/cve/cve-2020-27783
- https://access.redhat.com/errata/RHSA-2021:1761
- https://access.redhat.com/errata/RHSA-2021:1879
- https://access.redhat.com/errata/RHSA-2021:1898
- https://access.redhat.com/errata/RHSA-2021:3254
- https://www.cve.org/CVERecord?id=CVE-2020-27783 https://nvd.nist.gov/vuln/detail/CVE-2020-27783
- https://security-tracker.debian.org/tracker/CVE-2020-27783
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is CVE-2020-27783?
CVE-2020-27783 is a Cross-site Scripting (XSS) vulnerability found in the python-lxml's clean module.
How does CVE-2020-27783 work?
CVE-2020-27783 allows a remote attacker to run arbitrary HTML/JS code by exploiting the improper imitation of browsers in the module's parser.
What is the severity of CVE-2020-27783?
The severity of CVE-2020-27783 is medium with a CVSS score of 6.1.
Which software packages are affected by CVE-2020-27783?
The python-lxml package version 0:4.2.3-2.el8 and the following rh-python38 packages are affected: rh-python38-babel, rh-python38-python, rh-python38-python-cryptography, rh-python38-python-jinja2, rh-python38-python-lxml, rh-python38-python-pip, rh-python38-python-urllib3.
How can I fix CVE-2020-27783?
To fix CVE-2020-27783, upgrade the python-lxml package to version 4.6.2 or higher and ensure the affected rh-python38 packages are updated to the fixed versions provided by Red Hat.
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