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

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.1568
                          mailman security update
                                5 May 2020

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

Product:           mailman
Publisher:         Debian
Operating System:  Debian GNU/Linux 8
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-12137  

Reference:         ESB-2020.1435

Original Bulletin: 
   https://lists.debian.org/debian-lts-announce/2020/05/msg00002.html

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Package        : mailman
Version        : 1:2.1.18-2+deb8u5
CVE ID         : CVE-2020-12137


A vulnerability was discovered in mailman. GNU Mailman 2.x before 2.1.30
uses the .obj extension for scrubbed application/octet-stream MIME
parts. This behavior may contribute to XSS attacks against
list-archive visitors, because an HTTP reply from an archive web
server may lack a MIME type, and a web browser may perform MIME
sniffing, conclude that the MIME type should have been text/html, and
execute JavaScript code.


For Debian 8 "Jessie", this problem has been fixed in version
1:2.1.18-2+deb8u5.

We recommend that you upgrade your mailman packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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===========================================================================
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