Is CVE-2023-42669 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 2%.

What products does CVE-2023-42669 affect?

Tracked products affected include Samba. Check the version you run to see whether it is affected.

How do I fix CVE-2023-42669?

Apply the vendor fix in your normal patch cycle. Upgrade affected products to a fixed version.

CVE-2023-42669

Q: What is CVE-2023-42669?

CVE-2023-42669 is a medium-severity software vulnerability (Uncontrolled resource consumption) with a CVSS score of 6.5. A vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises becaus

MEDIUM severity · CVSS 6.5 · Uncontrolled resource consumption

6.5CVSS MEDIUM

Summary

A vulnerability was found in Samba's "rpcecho" development server, a non-Windows RPC server used to test Samba's DCE/RPC stack elements. This vulnerability stems from an RPC function that can be blocked indefinitely. The issue arises because the "rpcecho" service operates with only one worker in the main RPC task, allowing calls to the "rpcecho" server to be blocked for a specified time, causing service disruptions. This disruption is triggered by a "sleep()" call in the "dcesrv_echo_TestSleep()" function under specific conditions. Authenticated users or attackers can exploit this vulnerability to make calls to the "rpcecho" server, requesting it to block for a specified duration, effectively disrupting most services and leading to a complete denial of service on the AD DC. The DoS affects all other services as "rpcecho" runs in the main RPC task.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)2%

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

Affected products we track (1)

Samba

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

CVE-2023-42669

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information