Description
SOGo before 5.12.13 contains a denial of service vulnerability that allows authenticated attackers to exhaust all worker processes by configuring an auxiliary IMAP mail account pointing to a controlled host that accepts a TCP connection but never sends an IMAP greeting response. Attackers can issue concurrent GET requests to the mail view of this account to hold workers indefinitely without an effective timeout, occupying every SOGo worker and denying service to all users for approximately five minutes until the watchdog kills and respawns the stuck workers.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Alinto | sogo | < 5.12.13 | 5.12.13 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | sogo | No fix yet | — |
| Debian 12 | sogo | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | sogo | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | sogo | No fix yet | — |
| Ubuntu Pro 22.04 LTS | sogo | No fix yet | — |
| Ubuntu Pro 20.04 LTS | sogo | No fix yet | — |
| Ubuntu Pro 18.04 LTS | sogo | No fix yet | — |
| Ubuntu Pro 16.04 LTS | sogo | No fix yet | — |
References
- Vendor Patch patch release-notes
- VulnCheck Advisory: SOGo before 5.12.13 Denial of Service via Auxiliary IMAP Account Greeting Wait third-party-advisory