Upstream information
Description
In fail2ban 0.10.5 through 1.1.1 before ddd879d, the sshd filter (config/filter.d/sshd.conf) accepts an "on <token>" suffix after the host address. Because OpenSSH logs the offered username verbatim, a remote unauthenticated attacker can use a username such as "x VICTIM-SOURCE-IP-ADDRESS on" to make fail2ban associate failed login attempts with an arbitrary source IP address and ban it (e.g., to block logins from a legitimate user). The default filter mode is affected.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | CNA (MITRE) | SUSE |
|---|---|---|
| Base Score | 5.3 | 5.3 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| Attack Vector | Network | Network |
| Attack Complexity | Low | Low |
| Privileges Required | None | None |
| User Interaction | None | None |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | None | None |
| Integrity Impact | None | None |
| Availability Impact | Low | Low |
| CVSSv3 Version | 3.1 | 3.1 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP7 | fail2ban | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | fail2ban | Affected |
| SUSE Linux Enterprise Server 15 SP7 | fail2ban | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | fail2ban | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | fail2ban | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | fail2ban | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | fail2ban | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | fail2ban | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | fail2ban | Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | fail2ban | Affected |
| SUSE Linux Enterprise Server 15 SP4 | fail2ban | Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | fail2ban | Affected |
| SUSE Linux Enterprise Server 15 SP5 | fail2ban | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | fail2ban | Affected |
| SUSE Linux Enterprise Server 15 SP6 | fail2ban | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | fail2ban | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | fail2ban | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | fail2ban | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | fail2ban | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise Desktop 15 SP4 | fail2ban | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | fail2ban | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | fail2ban | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | fail2ban | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | fail2ban | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | fail2ban | Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | fail2ban | Affected |
| SUSE Manager Proxy 4.3 | fail2ban | Affected |
| SUSE Manager Proxy LTS 4.3 | fail2ban | Affected |
| SUSE Manager Retail Branch Server 4.3 | fail2ban | Affected |
| SUSE Manager Retail Branch Server LTS 4.3 | fail2ban | Affected |
| SUSE Manager Server 4.3 | fail2ban | Affected |
| SUSE Manager Server LTS 4.3 | fail2ban | Affected |
| openSUSE Leap 15.4 | fail2ban | Affected |
| openSUSE Leap 15.5 | fail2ban | Affected |
| openSUSE Leap 15.6 | fail2ban | Affected |
SUSE Timeline for this CVE
CVE page created: Tue Oct 13 16:11:42 2026CVE page last modified: Tue Oct 13 20:58:44 2026