CVE-2022-3094
An UPDATE message flood may cause named to exhaust all available memory
Severity Score
Exploit Likelihood
Affected Versions
Public Exploits
0Exploited in Wild
-Decision
Descriptions
Sending a flood of dynamic DNS updates may cause `named` to allocate large amounts of memory. This, in turn, may cause `named` to exit due to a lack of free memory. We are not aware of any cases where this has been exploited.
Memory is allocated prior to the checking of access permissions (ACLs) and is retained during the processing of a dynamic update from a client whose access credentials are accepted. Memory allocated to clients that are not permitted to send updates is released immediately upon rejection. The scope of this vulnerability is limited therefore to trusted clients who are permitted to make dynamic zone changes.
If a dynamic update is REFUSED, memory will be released again very quickly. Therefore it is only likely to be possible to degrade or stop `named` by sending a flood of unaccepted dynamic updates comparable in magnitude to a query flood intended to achieve the same detrimental outcome.
BIND 9.11 and earlier branches are also affected, but through exhaustion of internal resources rather than memory constraints. This may reduce performance but should not be a significant problem for most servers. Therefore we don't intend to address this for BIND versions prior to BIND 9.16.
This issue affects BIND 9 versions 9.16.0 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.8-S1 through 9.16.36-S1.
El envío de una avalancha de actualizaciones dinámicas de DNS puede hacer que ""named"" asigne grandes cantidades de memoria. Esto, a su vez, puede provocar que ""named"" se cierre debido a la falta de memoria libre.
No conocemos ningún caso en el que esto haya sido explotado. La memoria se asigna antes de verificar los permisos de acceso (ACL) y se retiene durante el procesamiento de una actualización dinámica de un cliente cuyas credenciales de acceso se aceptan. La memoria asignada a los clientes a los que no se les permite enviar actualizaciones se libera inmediatamente después del rechazo. Por lo tanto, el alcance de esta vulnerabilidad se limita a clientes confiables a quienes se les permite realizar cambios de zona dinámicos.
Si se RECHAZA una actualización dinámica, la memoria se liberará nuevamente muy rápidamente. Por lo tanto, es probable que sólo sea posible degradar o detener ""named"" enviando una avalancha de actualizaciones dinámicas no aceptadas comparable en magnitud a una avalancha de consultas destinadas a lograr el mismo resultado perjudicial.
BIND 9.11 y ramas anteriores también se ven afectadas, pero por el agotamiento de los recursos internos en lugar de por limitaciones de memoria. Esto puede reducir el rendimiento, pero no debería ser un problema importante para la mayoría de los servidores. Por lo tanto, no pretendemos abordar este problema para las versiones de BIND anteriores a BIND 9.16.
Este problema afecta a las versiones 9.16.0 a 9.16.36, 9.18.0 a 9.18.10, 9.19.0 a 9.19.8 y 9.16.8-S1 a 9.16.36-S1 de BIND 9.
A flaw was found in Bind, where sending a flood of dynamic DNS updates may cause named to allocate large amounts of memory. This issue may cause named to slow down due to a lack of free memory, resulting in a denial of service (DoS).
CVSS Scores
SSVC
- Decision:-
Timeline
- 2022-09-02 CVE Reserved
- 2023-01-25 CVE Published
- 2024-08-03 CVE Updated
- 2024-08-17 EPSS Updated
- ---------- Exploited in Wild
- ---------- KEV Due Date
- ---------- First Exploit
CWE
- CWE-20: Improper Input Validation
- CWE-416: Use After Free
CAPEC
References (3)
| URL | Tag | Source |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://kb.isc.org/docs/cve-2022-3094 | 2023-11-07 | |
| https://access.redhat.com/security/cve/CVE-2022-3094 | 2024-05-07 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2164032 | 2024-05-07 |
Affected Vendors, Products, and Versions
| Vendor | Product | Version | Other | Status | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Vendor | Product | Version | Other | Status | <-- --> | Vendor | Product | Version | Other | Status |
| Isc Search vendor "Isc" | Bind Search vendor "Isc" for product "Bind" | >= 9.16.0 < 9.16.37 Search vendor "Isc" for product "Bind" and version " >= 9.16.0 < 9.16.37" | - |
Affected
| ||||||
| Isc Search vendor "Isc" | Bind Search vendor "Isc" for product "Bind" | >= 9.18.0 < 9.18.11 Search vendor "Isc" for product "Bind" and version " >= 9.18.0 < 9.18.11" | - |
Affected
| ||||||
| Isc Search vendor "Isc" | Bind Search vendor "Isc" for product "Bind" | >= 9.19.0 < 9.19.9 Search vendor "Isc" for product "Bind" and version " >= 9.19.0 < 9.19.9" | - |
Affected
| ||||||
| Isc Search vendor "Isc" | Bind Search vendor "Isc" for product "Bind" | 9.16.8 Search vendor "Isc" for product "Bind" and version "9.16.8" | s1, supported_preview |
Affected
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| Isc Search vendor "Isc" | Bind Search vendor "Isc" for product "Bind" | 9.16.11 Search vendor "Isc" for product "Bind" and version "9.16.11" | s1, supported_preview |
Affected
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| Isc Search vendor "Isc" | Bind Search vendor "Isc" for product "Bind" | 9.16.13 Search vendor "Isc" for product "Bind" and version "9.16.13" | s1, supported_preview |
Affected
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| Isc Search vendor "Isc" | Bind Search vendor "Isc" for product "Bind" | 9.16.14 Search vendor "Isc" for product "Bind" and version "9.16.14" | s1, supported_preview |
Affected
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| Isc Search vendor "Isc" | Bind Search vendor "Isc" for product "Bind" | 9.16.21 Search vendor "Isc" for product "Bind" and version "9.16.21" | s1, supported_preview |
Affected
| ||||||
| Isc Search vendor "Isc" | Bind Search vendor "Isc" for product "Bind" | 9.16.32 Search vendor "Isc" for product "Bind" and version "9.16.32" | s1, supported_preview |
Affected
| ||||||
| Isc Search vendor "Isc" | Bind Search vendor "Isc" for product "Bind" | 9.16.36 Search vendor "Isc" for product "Bind" and version "9.16.36" | s1, supported_preview |
Affected
| ||||||