UNIX Symbolic Link (Symlink) Following vulnerability in the cronjob shipped with nagios of SUSE Linux Enterprise Server 12, SUSE Linux Enterprise Server 11; openSUSE Factory allows local attackers to cause cause DoS or potentially escalate privileges by winning a race. This issue affects: SUSE Linux Enterprise Server 12 nagios version 3.5.1-5.27 and prior versions. SUSE Linux Enterprise Server 11 nagios version 3.0.6-1.25.36.3.1 and prior versions. openSUSE Factory nagios version 4.4.5-2.1 and prior versions.
Weakness
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Nagios | Nagios | * | 3.5.1 (excluding) |
| Icinga | Ubuntu | trusty | * |
| Nagios3 | Ubuntu | trusty | * |
Potential Mitigations
- Follow the principle of least privilege when assigning access rights to entities in a software system.
- Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/132.html
- https://cwe.mitre.org/data/definitions/17.html
- https://cwe.mitre.org/data/definitions/35.html
- https://cwe.mitre.org/data/definitions/76.html
References
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00014.html
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00022.html
- https://bugzilla.suse.com/show_bug.cgi?id=1156309
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00014.html
- http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00022.html
- https://bugzilla.suse.com/show_bug.cgi?id=1156309