CVE-2015-6927

LOW 3.6CVE-2015-6927 · Published 28/09/2015 · updated 17/06/2026

In short

CVE-2015-6927 is a LOW (CVSS 3.6) vulnerability affecting vzctl (openvz).
Chance of exploitation in the next 30 days (EPSS): 0.50%, higher than 43.2% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
vzctl openvz	`≤ 4.9.3`	No fix yet

Description

vzctl before 4.9.4 determines the virtual environment (VE) layout based on the presence of root.hdd/DiskDescriptor.xml in the VE private directory, which allows local simfs container (CT) root users to change the root password for arbitrary ploop containers, as demonstrated by a symlink attack on the ploop container root.hdd file and then access a control panel.

References

debian.org/security/2015/dsa-3357
openvz.org/Download/vzctl/4.9.4 · Patch
security.gentoo.org/glsa/201701-30
src.openvz.org/projects/OVZL/repos/vzctl/commits/9e98ea630ac0e88b44e3e23c878a5166aeb74e1c · Exploit

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