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             AUSCERT External Security Bulletin Redistribution

                    USN-4308-1: Twisted vulnerabilities
                               20 March 2020


        AusCERT Security Bulletin Summary

Product:           Twisted
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Access Privileged Data         -- Remote/Unauthenticated
                   Modify Arbitrary Files         -- Remote/Unauthenticated
                   Denial of Service              -- Remote/Unauthenticated
                   Provide Misleading Information -- Remote/Unauthenticated
                   Reduced Security               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-10109 CVE-2020-10108 CVE-2019-12855
                   CVE-2019-12387 CVE-2019-9515 CVE-2019-9514

Reference:         ESB-2020.0943

Original Bulletin: 

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USN-4308-1: Twisted vulnerabilities
19 March 2020

twisted vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:

  o Ubuntu 19.10
  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS


Several security issues were fixed in Twisted.

Software Description

  o twisted - Event-based framework for internet applications


it was discovered that Twisted incorrectly validated or sanitized certain URIs
or HTTP methods. A remote attacker could use this issue to inject invalid
characters and possibly perform header injection attacks. (CVE-2019-12387)

It was discovered that Twisted incorrectly verified XMPP TLS certificates. A
remote attacker could possibly use this issue to perform a man-in-the-middle
attack and obtain sensitive information. (CVE-2019-12855)

It was discovered that Twisted incorrectly handled HTTP/2 connections. A remote
attacker could possibly use this issue to cause Twisted to hang or consume
resources, leading to a denial of service. This issue only affected Ubuntu
18.04 LTS and Ubuntu 19.10. (CVE-2019-9512, CVE-2019-9514, CVE-2019-9515)

Jake Miller and ZeddYu Lu discovered that Twisted incorrectly handled certain
content-length headers. A remote attacker could possibly use this issue to
perform HTTP request splitting attacks. (CVE-2020-10108, CVE-2020-10109)

Update instructions

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

Ubuntu 19.10
    python-twisted - 18.9.0-3ubuntu1.1
    python-twisted-bin - 18.9.0-3ubuntu1.1
    python-twisted-web - 18.9.0-3ubuntu1.1
    python3-twisted - 18.9.0-3ubuntu1.1
    python3-twisted-bin - 18.9.0-3ubuntu1.1
Ubuntu 18.04 LTS
    python-twisted - 17.9.0-2ubuntu0.1
    python-twisted-bin - 17.9.0-2ubuntu0.1
    python-twisted-web - 17.9.0-2ubuntu0.1
    python3-twisted - 17.9.0-2ubuntu0.1
    python3-twisted-bin - 17.9.0-2ubuntu0.1
Ubuntu 16.04 LTS
    python-twisted - 16.0.0-1ubuntu0.4
    python-twisted-bin - 16.0.0-1ubuntu0.4
    python-twisted-web - 16.0.0-1ubuntu0.4
    python3-twisted - 16.0.0-1ubuntu0.4

To update your system, please follow these instructions: https://
wiki.ubuntu.com/Security/Upgrades .

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


  o CVE-2019-12387
  o CVE-2019-12855
  o CVE-2019-9512
  o CVE-2019-9514
  o CVE-2019-9515
  o CVE-2020-10108
  o CVE-2020-10109

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