CVE-2023-42669
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.
How to fix
- samba samba4.17.12, 4.18.8, 4.19.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| samba samba | 4.0.0 ≤ v < 4.17.12, 4.18.0 ≤ v < 4.18.8, 4.19.0 ≤ v < 4.19.1 | 4.17.12, 4.18.8, 4.19.1 |
| redhat storage | 3.0 | — |
| redhat enterprise_linux | 8.0, 9.0 | — |
| redhat enterprise_linux_eus | 9.0 | — |
| redhat enterprise_linux_for_ibm_z_systems | 9.0_s390x | — |
| redhat enterprise_linux_for_ibm_z_systems_eus | 9.0_s390x | — |
| redhat enterprise_linux_for_power_little_endian | 9.0_ppc64le | — |
| redhat enterprise_linux_for_power_little_endian_eus | 9.0_ppc64le | — |
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