Description
Stalwart is a mail and collaboration server. Versions 0.13.3 and below contain an unbounded memory allocation vulnerability in the IMAP protocol parser which allows remote attackers to exhaust server memory, potentially triggering the system's out-of-memory (OOM) killer and causing a denial of service. The CommandParser implementation enforces size limits on its dynamic buffer in most parsing states, but several state handlers omit these validation checks. This issue is fixed in version 0.13.4. A workaround for this issue is to implement rate limiting and connection monitoring at the network level, however this does not provide complete protection.
Problem types
CWE-400: Uncontrolled Resource Consumption
CWE-789: Memory Allocation with Excessive Size Value
Product status
References
github.com/...alwart/security/advisories/GHSA-8jqj-qj5p-v5rr
github.com/...ommit/a8e631e881bded8128358732f18e02ca94a4e677
github.com/stalwartlabs/stalwart/releases/tag/v0.13.4
