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Ubuntu Security Notice USN-4308-2
March 30, 2020

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

- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in Twisted.

Software Description:
- twisted: Event-based framework for internet applications

Details:

USN-4308-1 fixed several vulnerabilities in Twisted. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory details:

 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)

 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 versions:

Ubuntu 14.04 ESM:
  python-twisted                  13.2.0-1ubuntu1.2+esm1
  python-twisted-bin              13.2.0-1ubuntu1.2+esm1
  python-twisted-web              13.2.0-1ubuntu1.2+esm1

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

References:
  https://usn.ubuntu.com/4308-2
  https://usn.ubuntu.com/4308-1
  CVE-2019-12387, CVE-2019-12855, CVE-2020-10108, CVE-2020-10109