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Veeam Backup & Replication is a proprietary backup app developed by Veeam for virtual environments built on VMware vSphere, Nutanix AHV, and Microsoft Hyper-V hypervisors. The software provides backup, restore and replication functionality for virtual machines, physical servers and workstations as well as cloud-based workload. Veeam Backup & Replication is positioned as a part of the Veeam Availability Suite bundle.
AA vulnerable process, Veeam.Backup.Service.exe (TCP 9401 by default), allows an unauthenticated user to request encrypted credentials. Exploit allows an unauthenticated user operating within the backup infrastructure network perimeter to obtain encrypted credentials stored in the configuration database.
Successful exploit would lead to an attacker gaining full access to the backup infrastructure hosts.
NOTE: This vulnerability has been reported by the CISA (America’s Cyber Defense Agency) to be known to be currently actively exploited in the wild as of 23rd August 2023
of the following products:
Customers are advised to update to the latest version. This vulnerability is resolved in the following Veeam Backup & Replication build numbers: 12 (build 12.0.0.1420 P20230223) or 11a (build 11.0.1.1261 P20230227). Links to the required patches are provided in the knowledgebase articles linked in the References.
NOTE: Remediation of this vulnerability by patching to a specific version indicated may not be sufficient to secure the product against further vulnerabilities discovered in later versions, subsequent to the publication of this guidance. Unless contra-indicated, customers are therefore advised to always upgrade to the latest version of the product available.
If you use an all-in-one Veeam appliance with no remote backup infrastructure components, you can temporarily block external connections to port TCP 9401 in the backup server firewall as a temporary remediation until the patch is installed.
NOTE: Caution should always be taken in applying any temporary mitigations listed. Mitigations are only recommended in cases where patches to remediate the vulnerability are not available, or cannot safely be applied to a given environment immediately. A given mitigation may not in all cases be recommended officially by the application vendor. The viability of any given temporary mitigation measure may vary, depending on server platform and existing configuration. Mitigations listed may incompletely remediate any given vulnerability. Configuration changes to implement listed mitigations may impact/disrupt required functionality within a given customer application. Care should therefore be taken to carefully analyse any listed mitigations for appropriateness to a given environment. Customers are advised to test any configuration changes prior to their being introduced into a production environment.
References:
Category: Sensitive Data Disclosure
AppCheck has added a plugin to detect the flaw that will run as part of your standard scans.
AppCheck is a software security vendor based in the UK, offering a leading security scanning platform that automates the discovery of security flaws within organisations websites, applications, network, and cloud infrastructure. AppCheck are authorized by the Common Vulnerabilities and Exposures (CVE) Program as a CVE Numbering Authority (CNA).
No software to download or install.
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