[<prev] [next>] [day] [month] [year] [list]
Message-ID: <9f7004a5-fac8-2968-4fac-d050cffe15da@apache.org>
Date: Tue, 12 Nov 2024 13:37:16 +0000
From: Daniel Augusto Veronezi Salvador <gutoveronezi@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2024-50386: Apache CloudStack: Directly downloaded templates
can be used to abuse KVM-based infrastructure
Severity: important
Affected versions:
- Apache CloudStack 4.0.0 through 4.18.2.4
- Apache CloudStack 4.19.0.0 through 4.19.1.2
Description:
Account users in Apache CloudStack by default are allowed to register templates to be downloaded directly to the primary storage for deploying instances. Due to missing validation checks for KVM-compatible templates in CloudStack 4.0.0 through 4.18.2.4 and 4.19.0.0 through 4.19.1.2, an attacker that can register templates, can use them to deploy malicious instances on KVM-based environments and exploit this to gain access to the host filesystems that could result in the compromise of resource integrity and confidentiality, data loss, denial of service, and availability of KVM-based infrastructure managed by CloudStack.
Users are recommended to upgrade to Apache CloudStack 4.18.2.5 or 4.19.1.3, or later, which addresses this issue.
Additionally, all user-registered KVM-compatible templates can be scanned and checked that they are flat files that should not be using any additional or unnecessary features. For example, operators can run the following command on their file-based primary storage(s) and inspect the output. An empty output for the disk being validated means it has no references to the host filesystems; on the other hand, if the output for the disk being validated is not empty, it might indicate a compromised disk. However, bear in mind that (i) volumes created from templates will have references for the templates at first and (ii) volumes can be consolidated while migrating, losing their references to the templates. Therefore, the command execution for the primary storages can show both false positives and false negatives.
for file in $(find /path/to/storage/ -type f -regex [a-f0-9\-]*.*); do echo "Retrieving file [$file] info. If the output is not empty, that might indicate a compromised disk; check it carefully."; qemu-img info -U $file | grep file: ; printf "\n\n"; done
For checking the whole template/volume features of each disk, operators can run the following command:
for file in $(find /path/to/storage/ -type f -regex [a-f0-9\-]*.*); do echo "Retrieving file [$file] info."; qemu-img info -U $file; printf "\n\n"; done
Credit:
Kiran Chavala <kiranchavala@...che.org> (reporter)
References:
https://cloudstack.apache.org/blog/security-release-advisory-4.18.2.5-4.19.1.3
https://lists.apache.org/thread/d0x83c2cyglzzdw8csbop7mj7h83z95y
https://cloudstack.apache.org/
https://www.cve.org/CVERecord?id=CVE-2024-50386
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
