cvelistv5 - cve-2025-59529

CVE-2025-59529 (GCVE-0-2025-59529)

Vulnerability from cvelistv5 – Published: 2025-12-18 20:25 – Updated: 2025-12-19 22:04

Title

simple protocol server ignores accepts unlimited connections and logs failures without limit

Summary

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions up to and including 0.9-rc2, the simple protocol server ignores the documented client limit and accepts unlimited connections, allowing for easy local DoS. Although `CLIENTS_MAX` is defined, `server_work()` unconditionally `accept()`s and `client_new()` always appends the new client and increments `n_clients`. There is no check against the limit. When client cannot be accepted as a result of maximal socket number of avahi-daemon, it logs unconditionally error per each connection. Unprivileged local users can exhaust daemon memory and file descriptors, causing a denial of service system-wide for mDNS/DNS-SD. Exhausting local file descriptors causes increased system load caused by logging errors of each of request. Overloading prevents glibc calls using nss-mdns plugins to resolve `*.local.` names and link-local addresses. As of time of publication, no known patched versions are available, but a candidate fix is available in pull request 808, and some workarounds are available. Simple clients are offered for nss-mdns package functionality. It is not possible to disable the unix socket `/run/avahi-daemon/socket`, but resolution requests received via DBus are not affected directly. Tools avahi-resolve, avahi-resolve-address and avahi-resolve-host-name are not affected, they use DBus interface. It is possible to change permissions of unix socket after avahi-daemon is started. But avahi-daemon does not provide any configuration for it. Additional access restrictions like SELinux can also prevent unwanted tools to access the socket and keep resolution working for trusted users.

Severity ?

5.5 (Medium)


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

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M

References

URL

Tags

	https://github.com/avahi/avahi/security/advisorie…	x_refsource_CONFIRM
	https://github.com/avahi/avahi/pull/808	x_refsource_MISC
	https://zeropath.com/blog/avahi-simple-protocol-s…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	avahi	avahi	Affected: <= 0.9-rc2

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2025-59529

Vulnerability from fkie_nvd - Published: 2025-12-18 21:15 - Updated: 2025-12-19 22:15

Severity ?

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/avahi/avahi/pull/808
	security-advisories@github.com	https://github.com/avahi/avahi/security/advisories/GHSA-73wf-3xmj-x82q
	security-advisories@github.com	https://zeropath.com/blog/avahi-simple-protocol-server-dos-cve-2025-59529
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2025/12/19/1

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
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  "descriptions": [
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      "lang": "en",
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    }
  ],
  "id": "CVE-2025-59529",
  "lastModified": "2025-12-19T22:15:51.283",
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MSRC_CVE-2025-59529

Vulnerability from csaf_microsoft - Published: 2025-12-02 00:00 - Updated: 2025-12-21 01:02

Summary

simple protocol server ignores accepts unlimited connections and logs failures without limit

Notes

Additional Resources

To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer

The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

JSON

To clipboard

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        "title": "Additional Resources"
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        "text": "The information provided in the Microsoft Knowledge Base is provided \\\"as is\\\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.",
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        }
      ],
      "title": "simple protocol server ignores accepts unlimited connections and logs failures without limit"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2025-59529 (GCVE-0-2025-59529)

FKIE_CVE-2025-59529

MSRC_CVE-2025-59529

Tags

Sightings

Nomenclature