Description
s2s/out.c in jabberd2 2.2.16 and earlier does not verify that a request was made for an XMPP Server Dialback response, which allows remote XMPP servers to spoof domains via a (1) Verify Response or (2) Authorization Response.
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 | jabberd2 | 2.2.17-1 | — |
| Debian 13 | jabberd2 | 2.2.17-1 | — |
| Debian 12 | jabberd2 | 2.2.17-1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Network Satellite 5 | jabberd | 2.2.8-20.el5sat | RHSA-2012:1538 |
| Red Hat Network Proxy 5 | jabberd | 2.2.8-20.el5sat | RHSA-2012:1539 |
Advisories 2
- RHSA-2012:1539 Red Hat Security Advisory: Red Hat Network Proxy server jabberd security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2012:1538 Red Hat Security Advisory: Red Hat Network Satellite server jabberd security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
References
- RHSA-2012:1538 vendor-advisory
- [oss-security] 20120822 CVE Request -- jabberd2: Prone to unsolicited XMPP Dialback attacks mailing-list
- [oss-security] 20120822 Re: CVE Request -- jabberd2: Prone to unsolicited XMPP Dialback attacks mailing-list
- 55167 vdb-entry
- 50124 third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=850872
- APPLE-SA-2013-03-14-1 vendor-advisory
- http://xmpp.org/resources/security-notices/server-dialback/
- https://github.com/Jabberd2/jabberd2/commit/aabcffae560d5fd00cd1d2ffce5d760353cf0a4d
- RHSA-2012:1539 vendor-advisory
- [jabberd2] 20120821 Fwd: [Security] Vulnerability in XMPP Server Dialback Implementations mailing-list
- 50859 third-party-advisory