Description
modules/xmpp/serv_xmpp.c in Citadel 7.86 and earlier does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.
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 6.0 | citadel | 7.83-2squeeze2 | DSA-2250-1 |
| Debian 5.0 | citadel | 7.37-8+lenny1 | DSA-2250-1 |
Advisories 1
- DSA-2250-1 citadel - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://code.citadel.org/cgit.cgi/git.citadel.org/commit/?id=27c991cc2059f5530d3d4e9689dc976b745f5b0c
- 48071 vdb-entry
- http://packages.debian.org/changelogs/pool/main/c/citadel/citadel_7.37-8+lenny1/changelog
- DSA-2250 vendor-advisory
- http://security.debian.org/debian-security/pool/updates/main/c/citadel/citadel_7.83-2squeeze2.diff.gz
- 44788 third-party-advisory
- http://packages.debian.org/changelogs/pool/main/c/citadel/citadel_7.83-2squeeze2/changelog
- http://code.citadel.org/cgit.cgi/git.citadel.org/commit/?id=95040add546a705cc2d1d8f16293141f9f9845a6