Samba: "rpcecho" development server allows denial of service via sleep() call on ad dc
CVSS score
6.5
EPSS probability
—
Risk score
0.7
Published
3 y ago
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Vulnerability description
DayBreach CVE AI Research
CVE-2023-42669 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
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: Affected Products and Software
Affected Products
The following products are affected by CVE-2023-42669 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | redhat | samba | View |
| 2 | Red Hat | Red Hat Enterprise Linux 8 | View |
| 3 | Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support | View |
| 4 | Red Hat | Red Hat Enterprise Linux 8.8 Extended Update Support | View |
| 5 | Red Hat | Red Hat Enterprise Linux 9 | View |
| 6 | Red Hat | Red Hat Enterprise Linux 9.0 Extended Update Support | View |
| 7 | Red Hat | Red Hat Enterprise Linux 9.2 Extended Update Support | View |
| 8 | Red Hat | Red Hat Virtualization 4 for Red Hat Enterprise Linux 8 | View |
| 9 | Red Hat | Red Hat Enterprise Linux 6 | View |
| 10 | Red Hat | Red Hat Enterprise Linux 7 | View |
| 11 | Red Hat | Red Hat Storage 3 | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| 6.5 | CVSS V3_1 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | CVE CNA |
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2023-42669 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2023-42669 weaknesses.
Attack Vector and Accessibility
Official Sources and Advisories
Similar Vulnerabilities
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