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CVE-2023-42669

MEDIUMCVSS 6.5/10EPSS 1.72%

Last modified

CVE-2023-42669 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 1.72% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
6.5/10

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

EPSS Probability
1.72%

74.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
SambaSamba>= 4.0.0, < 4.17.12
SambaSamba>= 4.18.0, < 4.18.8
SambaSamba>= 4.19.0, < 4.19.1
RedhatStorage3.0
RedhatEnterprise Linux8.0
RedhatEnterprise Linux9.0
RedhatEnterprise Linux Eus9.0
RedhatEnterprise Linux For Ibm Z Systems9.0_s390x
RedhatEnterprise Linux For Ibm Z Systems Eus9.0_s390x
RedhatEnterprise Linux For Power Little Endian9.0_ppc64le
RedhatEnterprise Linux For Power Little Endian Eus9.0_ppc64le

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-42669?
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.
How severe is CVE-2023-42669?
CVE-2023-42669 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.72% probability of exploitation in the next 30 days.
How do I fix CVE-2023-42669?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-42669?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST