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8.6 High

CVE-2025-59088 Python-kdcproxy: unauthenticated ssrf via realm‑controlled dns srv

Description

If kdcproxy receives a request for a realm which does not have server addresses defined in its configuration, by default, it will query SRV records in the DNS zone matching the requested realm name. This creates a server-side request forgery vulnerability, since an attacker could send a request for a realm matching a DNS zone where they created SRV records pointing to arbitrary ports and hostnames (which may resolve to loopback or internal IP addresses). This vulnerability can be exploited to probe internal network topology and firewall rules, perform port scanning, and exfiltrate data. Deployments where the "use_dns" setting is explicitly set to false are not affected.

CVSS 3.1 detail

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
Low
Privileges required
None
Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

Affected products and versions

Product Affected versions Fixed in
kdcproxy 1.1 earliest → < 1.1.0 1.1.0
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 10.0 Extended Update Support Versions not published
Red Hat Enterprise Linux 7 Extended Lifecycle Support Versions not published
Red Hat Enterprise Linux 8 8100020251028161822.823393 earliest → < 8100020251028161822.823393f5 8100020251028161822.823393f5
Red Hat Enterprise Linux 8.2 Advanced Update Support 8020020251106022345.792 earliest → < 8020020251106022345.792f4060 8020020251106022345.792f4060
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 8040020251103205102.5 earliest → < 8040020251103205102.5b01ab7e 8040020251103205102.5b01ab7e
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 8040020251103205102.5 earliest → < 8040020251103205102.5b01ab7e 8040020251103205102.5b01ab7e
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 8060020251030180424 earliest → < 8060020251030180424.ada582f1 8060020251030180424.ada582f1
Show the 10 other branches
Product Affected versions Fixed in
Red Hat Enterprise Linux 8.6 Telecommunications Update Service 8060020251030180424 earliest → < 8060020251030180424.ada582f1 8060020251030180424.ada582f1
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 8060020251030180424 earliest → < 8060020251030180424.ada582f1 8060020251030180424.ada582f1
Red Hat Enterprise Linux 8.8 Telecommunications Update Service 8080020251029082621 earliest → < 8080020251029082621.b0a6ceea 8080020251029082621.b0a6ceea
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 8080020251029082621 earliest → < 8080020251029082621.b0a6ceea 8080020251029082621.b0a6ceea
Red Hat Enterprise Linux 9 Versions not published
Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 9.4 Extended Update Support Versions not published
Red Hat Enterprise Linux 9.6 Extended Update Support Versions not published
Red Hat In-Vehicle Operating System 1 Versions not published

References

Timeline

  1. Published
  2. Last modified

Other CVEs of kdcproxy

The 2 CVEs of kdcproxy →
CVE-2025-59089 If an attacker causes kdcproxy to connect to an attacker-controlled KDC server (e.g 5.9 Medium
Track this CVE