Description
The generate_dialback function in the mod_dialback module in Prosody before 0.9.10 does not properly separate fields when generating dialback keys, which allows remote attackers to spoof XMPP network domains via a crafted stream id and domain name that is included in the target domain as a suffix.
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 14 | prosody | 0.9.10-1 | — |
| Debian 13 | prosody | 0.9.10-1 | — |
| Debian 12 | prosody | 0.9.10-1 | — |
| Debian 8 | prosody | 0.9.7-2+deb8u3 | DSA-3463-1 |
| Debian 7 | prosody | 0.8.2-4+deb7u4 | DSA-3463-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | prosody | 0.7.0-1squeeze1+deb6u2 | DLA-407-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | prosody | 0.9.10-1 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | prosody | 0.9.11-1.1 | openSUSE-SU-2024:10489-1 |
Advisories 3
- DLA-407-1 prosody - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3463-1 prosody - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10489-1 prosody-0.9.11-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- FEDORA-2016-e2c5111eda vendor-advisory
- 82241 vdb-entry
- FEDORA-2016-5a5c85c5a8 vendor-advisory
- https://prosody.im/issues/issue/596
- [oss-security] 20160127 CVE-2016-0756: Prosody XMPP server: insecure dialback key generation/validation algorithm mailing-list
- http://blog.prosody.im/prosody-0-9-10-released/
- DSA-3463 vendor-advisory
- https://prosody.im/security/advisory_20160127/