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Critical severity · published Oct 30, 2019
CVE-2018-21029
systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS
9.8
CVSS
3.1%
EPSS
No
On KEV
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)
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)3.1% · higher than 88% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
31 · source: NVD
SY
Systemd · Systemd Project
239 before 244 · source: NVD
Affected product
FE
Fedora
Fedoraproject
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-21029
CVE.org
https://www.cve.org/CVERecord?id=CVE-2018-21029
Third Party Advisory
https://blog.cloudflare.com/dns-encryption-explained/
Exploit
https://github.com/systemd/systemd/blob/v239/man/resolved.conf.xml#L199-L207
Exploit
https://github.com/systemd/systemd/blob/v243/man/resolved.conf.xml#L196-L207
Patch
https://github.com/systemd/systemd/blob/v243/src/resolve/resolved-dnstls-gnutls.c#L62-L63
Issue Tracking
https://github.com/systemd/systemd/issues/9397
Patch
https://github.com/systemd/systemd/pull/13870
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