The printing process can bypass local access protections to read files available through symlinks, bypassing local file restrictions. The printing process requires files in a specific format so arbitrary data cannot be read but it is possible that some local file information could be exposed. This vulnerability affects Firefox < 58.
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 |
|---|---|---|---|
| Firefox | Mozilla | * | 57.0.4 (including) |
| Firefox | Ubuntu | artful | * |
| Firefox | Ubuntu | bionic | * |
| Firefox | Ubuntu | devel | * |
| Firefox | Ubuntu | trusty | * |
| Firefox | Ubuntu | upstream | * |
| Firefox | 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
References
- http://www.securityfocus.com/bid/102786
- http://www.securitytracker.com/id/1040270
- https://bugzilla.mozilla.org/show_bug.cgi?id=1379276
- https://usn.ubuntu.com/3544-1/
- https://www.mozilla.org/security/advisories/mfsa2018-02/
- http://www.securityfocus.com/bid/102786
- http://www.securitytracker.com/id/1040270
- https://bugzilla.mozilla.org/show_bug.cgi?id=1379276
- https://usn.ubuntu.com/3544-1/
- https://www.mozilla.org/security/advisories/mfsa2018-02/