CVE-2022-32166 in ovs
Summary
by MITRE • 09/28/2022
In ovs versions v0.90.0 through v2.5.0 are vulnerable to heap buffer over-read in flow.c. An unsafe comparison of “minimasks” function could lead access to an unmapped region of memory. This vulnerability is capable of crashing the software, memory modification, and possible remote execution.
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Analysis
by VulDB Data Team • 05/22/2025
The vulnerability identified as CVE-2022-32166 affects the Open vSwitch (OVS) software within versions v0.90.0 through v2.5.0, presenting a critical heap buffer over-read condition in the flow.c module. This flaw stems from an unsafe comparison operation within the minimasks function that processes flow entries in the software switch implementation. The vulnerability occurs when the system processes flow table entries containing malformed or specially crafted data structures, leading to improper bounds checking during memory access operations. The issue manifests as an attempt to read memory beyond the allocated buffer boundaries, potentially accessing unmapped regions of memory that could contain sensitive data or trigger system instability.
The technical implementation of this vulnerability resides in the flow.c source file where the minimasks function performs comparisons between different flow mask structures without proper validation of buffer limits. When processing flow entries, the function fails to verify that memory access operations remain within allocated buffer boundaries, allowing an attacker to manipulate the flow table entry data to cause a heap buffer over-read. This type of vulnerability falls under CWE-125, which specifically addresses out-of-bounds read conditions, and represents a classic example of improper input validation leading to memory safety issues. The vulnerability's nature aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as it could potentially enable remote code execution through memory corruption that might be exploited to gain control over the system's execution flow.
The operational impact of CVE-2022-32166 extends beyond simple software crashes to encompass potential data corruption and remote code execution capabilities. When exploited, the heap buffer over-read can cause the OVS daemon to crash unpredictably, leading to denial of service conditions that disrupt network virtualization services. More critically, the memory access violations could allow attackers to modify memory contents in ways that might enable privilege escalation or code injection attacks, particularly when the vulnerable system is running with elevated privileges. The vulnerability affects network infrastructure components that rely on OVS for virtual switching operations, including cloud computing platforms, software-defined networking (SDN) controllers, and virtual machine networks where the switch component processes flow table entries from untrusted sources.
Mitigation strategies for CVE-2022-32166 should prioritize immediate patching of affected OVS versions to the latest stable releases that contain the fixed minimasks function implementation. Organizations should implement network segmentation and access controls to limit exposure of vulnerable OVS instances to untrusted networks or users. Additionally, monitoring systems should be configured to detect unusual memory access patterns or service disruptions that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper memory bounds checking in network infrastructure software and highlights the need for comprehensive input validation in critical system components. Security teams should also consider implementing runtime protections such as address space layout randomization and stack canaries to mitigate potential exploitation of similar memory safety issues in the broader OVS codebase.