CVE-2022-48340 in GlusterFS
Summary
by MITRE • 02/21/2023
In Gluster GlusterFS 11.0, there is an xlators/cluster/dht/src/dht-common.c dht_setxattr_mds_cbk use-after-free.
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Analysis
by VulDB Data Team • 03/23/2023
The vulnerability identified as CVE-2022-48340 represents a critical use-after-free flaw within the GlusterFS distributed file system version 11.0. This issue manifests in the dht-common.c source file at the dht_setxattr_mds_cbk function, where improper memory management leads to potential exploitation by malicious actors. The vulnerability arises from the failure to properly handle memory references after object deallocation, creating opportunities for arbitrary code execution or system compromise. GlusterFS, a widely deployed distributed storage solution, is particularly vulnerable to this flaw due to its complex translator architecture that manages distributed file operations across multiple nodes. The affected component specifically handles extended attribute operations within the distributed hash table (DHT) translator, which is fundamental to GlusterFS's distributed file system functionality and metadata management.
The technical implementation of this vulnerability stems from inadequate memory lifecycle management within the DHT translator's callback mechanism. When processing extended attribute operations, the system allocates memory for metadata structures and subsequently frees them without ensuring that all references to these structures are properly invalidated. The dht_setxattr_mds_cbk function, which handles callbacks from metadata servers, creates a window where freed memory can still be accessed through dangling pointers. This memory management error falls under the CWE-416 use-after-free category, where memory is accessed after it has been freed, and can be exploited through controlled manipulation of extended attribute operations. The flaw is particularly dangerous because it occurs during normal file system operations involving metadata updates, making exploitation potentially accessible through routine administrative tasks or automated processes.
The operational impact of CVE-2022-48340 extends beyond simple system instability, presenting significant security risks to organizations relying on GlusterFS for critical data storage operations. Attackers could leverage this vulnerability to execute arbitrary code with the privileges of the GlusterFS process, potentially leading to complete system compromise or data exfiltration. The distributed nature of GlusterFS means that exploitation could affect entire clusters, making this vulnerability particularly concerning for large-scale deployments. The vulnerability's exploitation pathway aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as attackers could inject malicious code through extended attribute manipulation. Additionally, the flaw could enable privilege escalation attacks where attackers gain elevated system privileges, and could facilitate persistence mechanisms through modified extended attributes that survive system restarts. Organizations using GlusterFS in cloud environments or hybrid deployments face increased risk due to the interconnected nature of distributed storage systems.
Mitigation strategies for CVE-2022-48340 should prioritize immediate patch application from the vendor, as the flaw exists in the core distributed file system functionality. Organizations should implement network segmentation and access controls to limit exposure of GlusterFS services to trusted networks only. Monitoring for unusual extended attribute operations and metadata changes should be implemented to detect potential exploitation attempts. The security community recommends disabling extended attribute operations where possible, particularly in environments where the vulnerability cannot be immediately patched. System administrators should also consider implementing intrusion detection systems with signatures specific to GlusterFS exploitation patterns, and conduct regular security assessments of distributed storage environments. The vulnerability's classification as a use-after-free error indicates that memory corruption techniques could be employed, making it essential to apply the latest security patches from the GlusterFS project and consider alternative storage solutions if immediate patching is not feasible.