A Improper Link Resolution Before File Access (Link Following) vulnerability in SUSE SUSE Linux Enterprise Desktop 15 SP5 postfix, SUSE SUSE Linux Enterprise High Performance Computing 15 SP5 postfix, SUSE openSUSE Leap 15.5 postfix.This issue affects SUSE Linux Enterprise Desktop 15 SP5: before 3.7.3-150500.3.5.1; SUSE Linux Enterprise High Performance Computing 15 SP5: before 3.7.3-150500.3.5.1; openSUSE Leap 15.5 : before 3.7.3-150500.3.5.1.
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 |
|---|---|---|---|
| Leap | Opensuse | 15.5 (including) | 15.5 (including) |
| Linux_enterprise_high_performance_computing | Suse | 15.0-sp5 (including) | 15.0-sp5 (including) |
| Suse_linux_enterprise_desktop | Suse | 15-sp5 (including) | 15-sp5 (including) |
| Postfix | Ubuntu | bionic | * |
| Postfix | Ubuntu | trusty | * |
| Postfix | Ubuntu | xenial | * |
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