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CVE-2021-28957

Status Candidate

Overview

An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.

Related Files

Gentoo Linux Security Advisory 202208-06
Posted Aug 10, 2022
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202208-6 - Multiple vulnerabilities have been discovered in lxml, the worst of which could result in denial of service. Versions less than 4.9.1 are affected.

tags | advisory, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2021-28957, CVE-2021-43818, CVE-2022-2309
SHA-256 | 6d9496250c6b1be096da8fdfc2ddf483123bdd7eda3323ea9efa66b39b901e0a
Red Hat Security Advisory 2021-4151-06
Posted Nov 10, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4151-06 - Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Issues addressed include code execution, cross site scripting, denial of service, and traversal vulnerabilities.

tags | advisory, denial of service, vulnerability, code execution, xss, python
systems | linux, redhat
advisories | CVE-2020-27619, CVE-2020-28493, CVE-2021-20095, CVE-2021-20270, CVE-2021-23336, CVE-2021-27291, CVE-2021-28957, CVE-2021-42771
SHA-256 | d49d4e9cc1d8294a10ad07970c659f1d865063f8fbef9fec6dfcfdf770c16f00
Red Hat Security Advisory 2021-4160-03
Posted Nov 10, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4160-03 - Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Issues addressed include cross site scripting, denial of service, and information leakage vulnerabilities.

tags | advisory, denial of service, vulnerability, xss, python
systems | linux, redhat
advisories | CVE-2021-28957, CVE-2021-29921, CVE-2021-33503, CVE-2021-3426, CVE-2021-3572, CVE-2021-3733, CVE-2021-3737
SHA-256 | d4c975c8f0fd0283493287448972680095337bb6113fc44f4837d867665d4273
Red Hat Security Advisory 2021-4162-05
Posted Nov 10, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4162-05 - Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Issues addressed include code execution, cross site scripting, denial of service, double free, information leakage, and traversal vulnerabilities.

tags | advisory, denial of service, vulnerability, code execution, xss, python
systems | linux, redhat
advisories | CVE-2019-18874, CVE-2020-28493, CVE-2021-20095, CVE-2021-23336, CVE-2021-28957, CVE-2021-29921, CVE-2021-33503, CVE-2021-3426, CVE-2021-3572, CVE-2021-42771
SHA-256 | e213dc130fe6c0f9ceeb6dbc6201ba34dd61a302b188cea3f4e8ad9fc8057754
Red Hat Security Advisory 2021-4158-02
Posted Nov 10, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-4158-02 - lxml is an XML processing library providing access to libxml2 and libxslt libraries using the Python ElementTree API. Issues addressed include a cross site scripting vulnerability.

tags | advisory, xss, python
systems | linux, redhat
advisories | CVE-2021-28957
SHA-256 | 8472376fba7ec24955a7559652e2b49c2c392f70a7459ea15b2eafd3c8add602
Red Hat Security Advisory 2021-3254-01
Posted Aug 30, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-3254-01 - Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Issues addressed include buffer overflow, code execution, cross site scripting, denial of service, information leakage, integer overflow, and traversal vulnerabilities.

tags | advisory, denial of service, overflow, vulnerability, code execution, xss, python
systems | linux, redhat
advisories | CVE-2020-25659, CVE-2020-27619, CVE-2020-27783, CVE-2020-28493, CVE-2020-36242, CVE-2021-20095, CVE-2021-23336, CVE-2021-28957, CVE-2021-29921, CVE-2021-3177, CVE-2021-33503, CVE-2021-3426, CVE-2021-3572
SHA-256 | f49b54d77f89082e96a8e69fc49612163d813deff1eacac5d74e788baf88efbf
Ubuntu Security Notice USN-4896-2
Posted Apr 8, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4896-2 - USN-4896-1 fixed a vulnerability in lxml. This update provides the corresponding update for Ubuntu 14.04 ESM. It was discovered that lxml incorrectly handled certain HTML attributes. A remote attacker could possibly use this issue to perform cross-site scripting attacks. Various other issues were also addressed.

tags | advisory, remote, xss
systems | linux, ubuntu
advisories | CVE-2021-28957
SHA-256 | f57a928b1fe28108b633e710e90b344d289d445878c2c1a598eb1bd819ee1877
Ubuntu Security Notice USN-4896-1
Posted Mar 31, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4896-1 - It was discovered that lxml incorrectly handled certain HTML attributes. A remote attacker could possibly use this issue to perform cross-site scripting attacks.

tags | advisory, remote, xss
systems | linux, ubuntu
advisories | CVE-2021-28957
SHA-256 | 93f52472d7a4524528bf2ff0ab669aad6e78f49528a1b838c29d43bc6b763650
Debian Security Advisory 4880-1
Posted Mar 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4880-1 - Kevin Chung discovered that lxml, a Python binding for the libxml2 and libxslt libraries, did not properly sanitize its input. This would allow a malicious user to mount a cross-site scripting attack.

tags | advisory, xss, python
systems | linux, debian
advisories | CVE-2021-28957
SHA-256 | 5a338b50348a8a2cbfdeaaaacc36baa39c17a7577fe75e672133625039e5da13
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