Large aggregation pipelines with a specific stage can crash mongod under default configuration
CVE-2021-32040

7.5HIGH

Key Information:

Vendor
MongoDB
Status
Mongodb Server
Vendor
CVE Published:
12 April 2022

Summary

It may be possible to have an extremely long aggregation pipeline in conjunction with a specific stage/operator and cause a stack overflow due to the size of the stack frames used by that stage. If an attacker could cause such an aggregation to occur, they could maliciously crash MongoDB in a DoS attack. This vulnerability affects MongoDB Server v4.4 versions prior to and including 4.4.28, MongoDB Server v5.0 versions prior to 5.0.4 and MongoDB Server v4.2 versions prior to 4.2.16.

Workaround: >= v4.2.16 users and all v4.4 users can add the --setParameter internalPipelineLengthLimit=50 instead of the default 1000 to mongod at startup to prevent a crash.

Affected Version(s)

MongoDB Server 5.0 < 5.0.4

MongoDB Server 4.4 <= 4.4.28

MongoDB Server 4.2 < 4.2.16

References

https://jira.mongodb.org/browse/SERVER-58203
x_refsource_MISC
https://jira.mongodb.org/browse/SERVER-59299
x_refsource_MISC
https://jira.mongodb.org/browse/SERVER-60218
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.