CVE-2018-21029 Security feature bypass in n/a
systemd's DNS over TLS implementation fails to validate hostnames, allowing man-in-the-middle attacks if a trusted CA is compromised.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2018-21029?
CVE-2018-21029 is a critical vulnerability in Fedoraproject Fedora, published on 30 Oct 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS. Server Name Indication (SNI) is not sent, and there is no hostname validation with the GnuTLS backend. NOTE: This has been disputed by the developer as not a vulnerability since hostname validation does not have anything to do with this issue (i.e. there is no hostname to be sent)
Weakness: CWE-295
Which versions are affected by CVE-2018-21029?
It affects 2 products.
Products include Fedoraproject Fedora, Systemd Project Systemd.
How do I fix CVE-2018-21029?
Apply the vendor's patch.
Is CVE-2018-21029 being exploited?
There is no known exploitation of CVE-2018-21029 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as DEBIAN-CVE-2018-21029, GHSA-h2fw-qh29-9jv7.