// For flags

CVE-2022-3924

named configured to answer from stale cache may terminate unexpectedly at recursive-clients soft quota

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

This issue can affect BIND 9 resolvers with `stale-answer-enable yes;` that also make use of the option `stale-answer-client-timeout`, configured with a value greater than zero.

If the resolver receives many queries that require recursion, there will be a corresponding increase in the number of clients that are waiting for recursion to complete. If there are sufficient clients already waiting when a new client query is received so that it is necessary to SERVFAIL the longest waiting client (see BIND 9 ARM `recursive-clients` limit and soft quota), then it is possible for a race to occur between providing a stale answer to this older client and sending an early timeout SERVFAIL, which may cause an assertion failure.
This issue affects BIND 9 versions 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1.

Este problema puede afectar a los solucionadores BIND 9 con `stale-answer-enable yes;` que también utilizan la opción `stale-answer-client-timeout`, configurada con un valor mayor que cero. Si el solucionador recibe muchas consultas que requieren recursividad, habrá un aumento correspondiente en la cantidad de clientes que están esperando que se complete la recursividad. Si ya hay suficientes clientes esperando cuando se recibe una nueva consulta de cliente, por lo que es necesario SERVFAIL al cliente que espera más tiempo (consulte el límite y la cuota suave de `clientes recursivos` de BIND 9 ARM), entonces es posible que se produzca una carrera. entre proporcionar una respuesta obsoleta a este cliente anterior y enviar un SERVFAIL de tiempo de espera anticipado, que puede provocar un error de aserción. Este problema afecta a las versiones de BIND 9, 9.16.12 a 9.16.36, 9.18.0 a 9.18.10, 9.19.0 a 9.19.8 y 9.16.12-S1 a 9.16.36-S1.

A flaw was found in Bind. When resolver receives many queries requiring recursion, there will be a corresponding increase in the number of clients waiting for recursion to complete. This may, under certain conditions, lead to an assertion failure and a denial of service.

*Credits: ISC would like to thank Maksym Odinintsev from AWS for bringing this vulnerability to our attention.
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2022-11-10 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-617: Reachable Assertion
CAPEC
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"
 >= 9.16.12 < 9.16.37
Search vendor "Isc" for product "Bind" and version " >= 9.16.12 < 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"
 9.16.12
Search vendor "Isc" for product "Bind" and version "9.16.12"
s1, supported_preview
Affected
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
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
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