Ubuntu Security Notice USN-4308-1 ≈ Packet Storm

Ubuntu Security Notice USN-4308-1
March 19, 2020

twisted vulnerabilities

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

– Ubuntu 19.10
– Ubuntu 18.04 LTS
– Ubuntu 16.04 LTS


Several security issues were fixed in Twisted.

Software Description:
– 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.

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,

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,

Update instructions:

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

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

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

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

Package Information:

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