SB2019061624 - Improper Certificate Validation in Twisted Web
Published: June 16, 2019 Updated: August 3, 2020
Security Bulletin ID
SB2019061624
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Certificate Validation (CVE-ID: CVE-2019-12855)
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
In words.protocols.jabber.xmlstream in Twisted through 19.2.1, XMPP support did not verify certificates when used with TLS, allowing an attacker to MITM connections.
Remediation
Install update from vendor's website.
References
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00013.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00028.html
- https://github.com/twisted/twisted/pull/1147
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PLTZDMFBNFSJMBXYJNGJHENJA4H2TSMZ/
- https://twistedmatrix.com/trac/ticket/9561
- https://usn.ubuntu.com/4308-1/
- https://usn.ubuntu.com/4308-2/
- https://www.oracle.com/security-alerts/cpuapr2020.html