Description
An issue in provider/libserver/ECKrbAuth.cpp of Kopano Core <= v11.0.2.51 contains an issue which allows attackers to authenticate even if the user account or password is expired. It also exists in the predecessor Zarafa Collaboration Platform (ZCP) in provider/libserver/ECPamAuth.cpp of Zarafa >= 6.30 (introduced between 6.30.0 RC1e and 6.30.8 final).
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 10 | kopanocore | 8.7.0-3+deb10u1 | DLA-3354-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | kopanocore | 8.7.0-7.1ubuntu10.1 | USN-6876-1 |
| Ubuntu 20.04 LTS | kopanocore | 8.7.0-7ubuntu1.1 | USN-6876-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | kopanocore | 8.5.5-0ubuntu1+esm1 | USN-6876-1 |
Advisories 2
- USN-6876-1 kopanocore vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-3354-1 kopanocore - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://kopano.com/
- https://stash.kopano.io/projects/KC/repos/kopanocore/browse/provider/libserver/ECKrbAuth.cpp#137
- [debian-lts-announce] 20230306 [SECURITY] [DLA 3354-1] kopanocore security update mailing-list
- https://jira.kopano.io/browse/KC-2021
- https://github.com/Kopano-dev/kopano-core/blob/master/provider/libserver/ECKrbAuth.cpp#L137
- https://bugzilla.redhat.com/show_bug.cgi?id=2192126
- https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2023-342b96903b
- https://src.fedoraproject.org/rpms/zarafa/c/a5a8366ccf07f248fae6edffb5123cfda579bfdb?branch=epel7