Description
A denial of service vulnerability exists in the lasso_provider_verify_saml_signature functionality of Entr'ouvert Lasso 2.5.1. A specially crafted SAML response can lead to a denial of service. An attacker can send a malformed SAML response to trigger this vulnerability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Entr'ouvert | Lasso | 2.5.1 | — |
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 | lasso | 2.9.0-1 | — |
| Debian 13 | lasso | 2.8.2-9+deb13u1 | DSA-6058-1 |
| Debian 12 | lasso | 2.8.1-1+deb12u1 | DSA-6058-1 |
| Debian 11 | lasso | 2.6.1-3+deb11u1 | DLA-4397-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | lasso | 2.8.2-2ubuntu0.1 | USN-7872-1 |
| Ubuntu 22.04 LTS | lasso | 2.7.0-2ubuntu0.1 | USN-7872-1 |
| Ubuntu 20.04 LTS | lasso | No fix yet | — |
| Ubuntu 18.04 LTS | lasso | No fix yet | — |
| Ubuntu 16.04 LTS | lasso | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | lasso | 2.8.2-150600.3.5.1 | SUSE-SU-2025:4068-1 |
| SLES 15 SP6 | lasso | 2.8.2-150600.3.5.1 | SUSE-SU-2025:4068-1 |
| SLES 15 SP5 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
| SLES 15 SP4 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
| SLES 15 SP3 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | lasso | 2.6.1-8.12.1 | SUSE-SU-2025:4094-1 |
| SLES for SAP 16.0 | lasso | 2.8.2-160000.3.1 | SUSE-SU-2025:21140-1 |
| SLES for SAP 15 SP5 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
| SLES for SAP 15 SP4 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
| SLES for SAP 15 SP3 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
| SLES 16.0 | lasso | 2.8.2-160000.3.1 | SUSE-SU-2025:21140-1 |
| SLE HPC 15 SP5 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
| SLE HPC 15 SP4 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
| SLE HPC 15 SP3 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
| SUSE Manager Server LTS 4.3 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
| SUSE Manager Proxy LTS 4.3 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
| SUSE Enterprise Storage 7.1 | lasso | 2.6.1-150200.24.1 | SUSE-SU-2025:4090-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | lasso | 2.8.2-160000.3.1 | openSUSE-SU-2025:20083-1 |
| openSUSE Leap 15.6 | lasso | 2.8.2-150600.3.5.1 | SUSE-SU-2025:4068-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | lasso +3 | 2.9.0-1.amzn2023 | ALAS2023-2025-1285 |
| Amazon Linux 2 | lasso +2 | 2.9.0-1.amzn2.0.1 | ALAS2-2025-3077 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | lasso | 2.9.0-1 | — |
| Azure Linux 2 (CBL-Mariner) | lasso | No fix yet | — |
Advisories 10
- USN-7872-1 lasso vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:20083-1 Security update for lasso SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4068-1 Security update for lasso SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4090-1 Security update for lasso SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21140-1 Security update for lasso SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4094-1 Security update for lasso SUSE / openSUSE Security Updates · Feb 4, 2026
- DLA-4397-1 lasso - security update Debian Security (DSA / DLA) · Dec 8, 2025
- DSA-6058-1 lasso - security update Debian Security (DSA / DLA) · Nov 15, 2025
- ALAS2-2025-3077 Critical: lasso security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 10, 2025
- ALAS2023-2025-1285 Critical: lasso security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 10, 2025