Description
An issue was discovered in LINBIT csync2 through 2.0. It does not correctly check for the return value GNUTLS_E_WARNING_ALERT_RECEIVED of the gnutls_handshake() function. It neglects to call this function again, as required by the design of the API.
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 | — |
| Debian 9 | csync2 | 2.0-8-g175a01c-4+deb9u2 | DLA-2515-1 |
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 1 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 |
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
- DLA-2515-1 csync2 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2021:0853-1 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