CVE-2023-26432

Description

When adding an external mail account, processing of SMTP "capabilities" responses are not limited to plausible sizes. Attacker with access to a rogue SMTP service could trigger requests that lead to excessive resource usage and eventually service unavailability. We now limit accepted SMTP server response to reasonable length/size. No publicly available exploits are known.

Weakness classification

• CWE-400: Uncontrolled Resource Consumption

Primary references

• security@open-xchange.com — Third Party Advisory, VDB Entry
• security@open-xchange.com — Mailing List, Third Party Advisory
• security@open-xchange.com
• security@open-xchange.com — Release Notes
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory, VDB Entry
• af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes