Description
An issue was discovered in LINBIT csync2 through 2.0. csync_daemon_session in daemon.c neglects to force a failure of a hello command when the configuration requires use of SSL.
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 | csync2 | 2.0-25-gc0faaf9-1 | — |
| Debian 13 | csync2 | 2.0-25-gc0faaf9-1 | — |
| Debian 12 | csync2 | 2.0-25-gc0faaf9-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | csync2 | No fix yet | — |
| Ubuntu 18.04 LTS | csync2 | No fix yet | — |
| Ubuntu 16.04 LTS | csync2 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | csync2 | 2.0+git.1461714863.10636a4-4.6.1 | SUSE-SU-2021:1858-1 |
| SLES 15 SP1 | csync2 | 2.0+git.1461714863.10636a4-4.6.1 | SUSE-SU-2021:1858-1 |
| SLES 15 | csync2 | 2.0+git.1461714863.10636a4-4.6.1 | SUSE-SU-2021:1858-1 |
| SLES 12 SP5 | csync2 | 2.0+git.1368794815.cf835a7-3.9.5 | SUSE-SU-2021:1952-1 |
| SLES 12 SP4 | csync2 | 2.0+git.1368794815.cf835a7-3.9.5 | SUSE-SU-2021:1952-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | csync2 | 2.0+git.1368794815.cf835a7-3.9.5 | SUSE-SU-2021:1952-1 |
| SLES 11 SP4 | csync2 | 1.34-0.13.7.1 | SUSE-SU-2021:14763-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | csync2 | 2.0+git.1600444747.83b3644-1.3 | openSUSE-SU-2024:10706-1 |
| openSUSE Leap 15.2 | csync2 | 2.0+git.1461714863.10636a4-lp152.5.3.1 | openSUSE-SU-2021:0853-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | csync2 | 2.0-r3 | — |
| Alpine v3.23 | csync2 | 2.0-r3 | — |
| Alpine v3.22 | csync2 | 2.0-r3 | — |
| Alpine v3.21 | csync2 | 2.0-r3 | — |
| Alpine v3.20 | csync2 | 2.0-r3 | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | csync2 | 2.0-r3 | — |
| Alpine v3.18 | csync2 | 2.0-r3 | — |
| Alpine v3.17 | csync2 | 2.0-r3 | — |
| Alpine v3.16 | csync2 | 2.0-r3 | — |
| Alpine v3.15 | csync2 | 2.0-r3 | — |
| Alpine v3.14 | csync2 | 2.0-r3 | — |
Advisories 5
- openSUSE-SU-2021:0853-1 Security update for csync2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:14763-1 Security update for csync2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1952-1 Security update for csync2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10706-1 csync2-2.0+git.1600444747.83b3644-1.3 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:1858-1 Security update for csync2 SUSE / openSUSE Security Updates · Feb 4, 2026