lxml: Cross-site Scripting -- Remote with User Interaction

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.1192
                      USN-4896-2: lxml vulnerability
                               9 April 2021

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           lxml
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-28957  

Reference:         ESB-2021.1099
                   ESB-2021.1081

Original Bulletin: 
   https://ubuntu.com/security/notices/USN-4896-2

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USN-4896-2: lxml vulnerability
08 April 2021

lxml could allow cross-site scripting (XSS) attacks.
Releases

  o Ubuntu 14.04 ESM

Packages

  o lxml - pythonic binding for the libxml2 and libxslt libraries

Details

USN-4896-1 fixed a vulnerability in lxml. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that lxml incorrectly handled certain HTML attributes. A
remote attacker could possibly use this issue to perform cross-site
scripting (XSS) attacks.

Update instructions

The problem can be corrected by updating your system to the following package
versions:

Ubuntu 14.04

  o python3-lxml - 3.3.3-1ubuntu0.2+esm3
  o python-lxml - 3.3.3-1ubuntu0.2+esm3

In general, a standard system update will make all the necessary changes.

References

  o CVE-2021-28957

Related notices

  o USN-4896-1 : python-lxml, python3-lxml, lxml

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