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Incorrect request error handling triggers server crash

Moderate
gwynne published GHSA-3mwq-h3g6-ffhm Oct 5, 2023

Package

swift vapor (Swift)

Affected versions

4.83.2...4.84.1

Patched versions

4.84.2

Description

Vapor incorrectly handles errors encountered during parsing of HTTP 1.x requests, triggering a precondition failure in swift-nio due to API misuse and causing immediate termination of the server process.

Impact

This is a denial of service vulnerability, impacting all users of affected versions of Vapor. Because the crash is an explicit assertion failure, there is no corruption of process state and no risk of data leakage or unauthorized code execution. Total impact is limited to an immediately recoverable service interruption.

Patches

The issue is fixed as of Vapor release 4.84.2.

Workarounds

None known at this time.

For more information

If you have any questions or comments about this advisory:

Acknowledgements

Full credit for reporting this issue goes to @t0rchwo0d, with additional thanks for responsibly disclosing.

Severity

Moderate
5.3
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVE ID

CVE-2023-44386

Credits