Red Hat Fuse 7 /etc/passwd default permission

Summaryinfo

A vulnerability was found in Red Hat Fuse 7. It has been declared as critical. This vulnerability affects unknown code of the file /etc/passwd. Such manipulation leads to default permission. This vulnerability is traded as CVE-2025-57849. An attack has to be approached locally. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Red Hat Fuse 7. Affected by this issue is some unknown processing of the file /etc/passwd. The manipulation with an unknown input leads to a default permission vulnerability. Using CWE to declare the problem leads to CWE-276. During installation, installed file permissions are set to allow anyone to modify those files. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A container privilege escalation flaw was found in certain Fuse images. This issue stems from the /etc/passwd file being created with group-writable permissions during build time. In certain conditions, an attacker who can execute commands within an affected container, even as a non-root user, can leverage their membership in the root group to modify the /etc/passwd file. This could allow the attacker to add a new user with any arbitrary UID, including UID 0, leading to full root privileges within the container.

The advisory is shared for download at access.redhat.com. This vulnerability is handled as CVE-2025-57849 since 08/21/2025. The exploitation is known to be difficult. The attack needs to be approached locally. Additional levels of successful authentication are needed for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 03/20/2026). The MITRE ATT&CK project declares the attack technique as T1222.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Red Hat

Name

• Fuse

Version

• 7

License

• open-source

Website

• Vendor: https://www.redhat.com/

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