Description
The canonicalize_username function in svnserve/cyrus_auth.c in Apache Subversion before 1.8.16 and 1.9.x before 1.9.4, when Cyrus SASL authentication is used, allows remote attackers to authenticate and bypass intended access restrictions via a realm string that is a prefix of an expected repository realm string.
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 | subversion | 1.9.4-1 | — |
| Debian 13 | subversion | 1.9.4-1 | — |
| Debian 12 | subversion | 1.9.4-1 | — |
| Debian 8 | subversion | 1.8.10-6+deb8u4 | DSA-3561-1 |
| Debian 7 | subversion | 1.6.17dfsg-4+deb7u11 | DLA-448-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | subversion | 1.9.3-2ubuntu1.1 | USN-3388-1 |
| Ubuntu 14.04 LTS | subversion | 1.8.8-1ubuntu3.3 | USN-3388-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | subversion | 1.8.19-25.3.1 | SUSE-SU-2017:2200-1 |
| SLES 12 SP2 | subversion | 1.8.19-25.3.1 | SUSE-SU-2017:2200-1 |
| SLES 12 SP1 | subversion | 1.8.10-21.1 | SUSE-SU-2016:1249-1 |
| SLES 12 | subversion | 1.8.10-21.1 | SUSE-SU-2016:1249-1 |
| SLES 11 SP4 | subversion | 1.6.17-1.35.1 | SUSE-SU-2016:1511-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Studio Onsite 1.3 | subversion | 1.6.17-1.35.1 | SUSE-SU-2016:1511-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | subversion | 1.9.5-1.1 | openSUSE-SU-2024:10538-1 |
Advisories 7
- USN-3388-1 subversion vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-448-1 subversion - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3561-1 subversion - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:2200-1 Security update for subversion SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10538-1 libsvn_auth_gnome_keyring-1-0-1.9.5-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1511-1 Security update for subversion SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1249-1 Security update for subversion SUSE / openSUSE Security Updates · Feb 4, 2026
References
- FEDORA-2016-20cc04ac50 vendor-advisory
- 89417 vdb-entry
- [subversion-announce] 20160428 [ANNOUNCE][SECURITY] Apache Subversion 1.8.16 released mailing-list
- SSA:2016-121-01 vendor-advisory
- openSUSE-SU-2016:1264 vendor-advisory
- [subversion-announce] 20160428 [ANNOUNCE][SECURITY] Apache Subversion 1.9.4 released mailing-list
- openSUSE-SU-2016:1263 vendor-advisory
- DSA-3561 vendor-advisory
- 1035706 vdb-entry
- GLSA-201610-05 vendor-advisory
- https://www.oracle.com/security-alerts/cpuoct2020.html
- http://subversion.apache.org/security/CVE-2016-2167-advisory.txt