DNSSEC Signature Skipping in systemd-resolved Allows MITM (CVE-2023-7008)
CVE-2023-7008 Published on December 23, 2023

Systemd-resolved: unsigned name response in signed zone is not refused when dnssec=yes
A vulnerability was found in systemd-resolved. This issue may allow systemd-resolved to accept records of DNSSEC-signed domains even when they have no signature, allowing man-in-the-middles (or the upstream DNS resolver) to manipulate records.

Vendor Advisory Vendor Advisory NVD

Vulnerability Analysis

CVE-2023-7008 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
HIGH
Availability Impact:
NONE

Timeline

Reported to Red Hat.

Made public.

Weakness Type

What is a Man-in-the-Middle / MITM Vulnerability?

The product does not adequately verify the identity of actors at both ends of a communication channel, or does not adequately ensure the integrity of the channel, in a way that allows the channel to be accessed or influenced by an actor that is not an endpoint. In order to establish secure communication between two parties, it is often important to adequately verify the identity of entities at each end of the communication channel. Inadequate or inconsistent verification may result in insufficient or incorrect identification of either communicating entity. This can have negative consequences such as misplaced trust in the entity at the other end of the channel. An attacker can leverage this by interposing between the communicating entities and masquerading as the original entity. In the absence of sufficient verification of identity, such an attacker can eavesdrop and potentially modify the communication between the original entities.

CVE-2023-7008 has been classified to as a Man-in-the-Middle / MITM vulnerability or weakness.


Products Associated with CVE-2023-7008

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-7008 are published in these products:

Systemdproject Systemd
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Cryostat
 

Affected Versions

Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Cryostat 2:

Exploit Probability

EPSS
0.44%
Percentile
63.14%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.