Description
librsync before 1.0.0 uses a truncated MD4 checksum to match blocks, which makes it easier for remote attackers to modify transmitted data via a birthday attack.
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 | librsync | 2.0.2-1 | — |
| Debian 13 | librsync | 2.0.2-1 | — |
| Debian 12 | librsync | 2.0.2-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | librsync | No fix yet | — |
| Ubuntu 16.04 LTS | librsync | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | rsync | 3.1.0-6.1 | SUSE-SU-2016:0173-1 |
| SLES 12 | rsync | 3.1.0-6.1 | SUSE-SU-2016:0173-1 |
| SLES 11 SP4 | rsync | 3.0.4-2.49.1 | SUSE-SU-2016:0176-1 |
| SLES 11 SP3 | rsync | 3.0.4-2.49.1 | SUSE-SU-2016:0176-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | rsync | 3.1.0-6.1 | SUSE-SU-2016:0173-1 |
| SLES for SAP 12 | rsync | 3.1.0-6.1 | SUSE-SU-2016:0173-1 |
| SLES for SAP 11 SP4 | rsync | 3.0.4-2.49.1 | SUSE-SU-2016:0176-1 |
| SLES for SAP 11 SP3 | rsync | 3.0.4-2.49.1 | SUSE-SU-2016:0176-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | librsync | 1.0.0-2.8 | openSUSE-SU-2024:10257-1 |
| openSUSE Tumbleweed | rsync | 3.1.2-1.5 | openSUSE-SU-2024:10548-1 |
Advisories 4
- SUSE-SU-2016:0173-1 Security update for rsync SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10257-1 librsync-devel-1.0.0-2.8 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:0176-1 Security update for rsync SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10548-1 rsync-3.1.2-1.5 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- FEDORA-2015-3366 vendor-advisory
- openSUSE-SU-2015:1752 vendor-advisory
- [oss-security] 20140805 [CVE Requests] rsync and librsync collisions mailing-list
- FEDORA-2015-3497 vendor-advisory
- [oss-security] 20140728 rsync vulnerable to collisions mailing-list
- GLSA-201605-04 vendor-advisory
- https://github.com/librsync/librsync/issues/5
- [oss-security] 20141012 Re: [CVE Requests] rsync and librsync collisions mailing-list
- https://www.miknet.net/security/optimizing-birthday-attack/
- FEDORA-2015-2923 vendor-advisory
- https://github.com/librsync/librsync/releases/tag/v1.0.0
- https://bugzilla.redhat.com/show_bug.cgi?id=1126712