CVE-2021-32518

A vulnerability in share_link in QSAN Storage Manager allows remote attackers to create a symbolic link then access arbitrary files. The referred vulnerability has been solved with the updated version of QSAN Storage Manager v3.3.3.

Weakness

The product, when opening a file or directory, does not sufficiently account for when the file is a symbolic link that resolves to a target outside of the intended control sphere. This could allow an attacker to cause the product to operate on unauthorized files.

Affected Software

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/27.html

References

• https://www.twcert.org.tw/tw/cp-132-4874-79edc-1.html
• https://www.twcert.org.tw/tw/cp-132-4874-79edc-1.html