Portage before 2.0.50-r3 allows local users to overwrite arbitrary files via a hard link attack on the lockfiles.
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 |
|---|---|---|---|
| Portage | Gentoo | * | 2.0.50 (excluding) |
| Portage | Gentoo | 2.0.50 (including) | 2.0.50 (including) |
| Linux | Gentoo | 1.4 (including) | 1.4 (including) |
| Linux | Gentoo | 1.4-rc1 (including) | 1.4-rc1 (including) |
| Linux | Gentoo | 1.4-rc2 (including) | 1.4-rc2 (including) |
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://secunia.com/advisories/11305
- http://security.gentoo.org/glsa/glsa-200404-01.xml
- http://www.securityfocus.com/bid/10060
- https://exchange.xforce.ibmcloud.com/vulnerabilities/15754
- http://secunia.com/advisories/11305
- http://security.gentoo.org/glsa/glsa-200404-01.xml
- http://www.securityfocus.com/bid/10060
- https://exchange.xforce.ibmcloud.com/vulnerabilities/15754