CVE-2022-26434 in MT6833
Summary
by MITRE • 08/01/2022
In mailbox, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07138450; Issue ID: ALPS07138450.
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Analysis
by VulDB Data Team • 08/29/2022
The vulnerability identified as CVE-2022-26434 resides within the mailbox component of a mobile operating system, specifically affecting Android-based devices. This issue represents a critical security flaw that stems from an insufficient bounds checking mechanism during memory operations. The vulnerability manifests as an out of bounds write condition that occurs when processing certain email messages or mailbox data structures. According to the patch identifier ALPS07138450 and issue identifier ALPS07138450, this represents a targeted fix for a specific kernel-level component within the Android system.
The technical implementation of this vulnerability involves a missing validation check that should have occurred before writing data to memory locations. When the mailbox component processes incoming data without proper boundary verification, an attacker can craft malicious input that exceeds the allocated memory buffer boundaries. This allows for arbitrary memory modification, which can be exploited to overwrite critical system data structures or function pointers. The vulnerability falls under CWE-129, which specifically addresses insufficient bounds checking, and represents a classic example of buffer overflow conditions that have been extensively documented in cybersecurity literature. The absence of user interaction requirements makes this particularly dangerous as exploitation can occur automatically without any conscious action from the victim.
The operational impact of this vulnerability extends beyond simple data corruption, as it provides a pathway for local privilege escalation. An attacker who successfully exploits this vulnerability can gain system-level execution privileges, effectively elevating their access from a regular user context to a privileged system context. This escalation allows for complete control over the device, including the ability to read, modify, or delete any data stored on the device. The system execution privileges needed for exploitation align with ATT&CK technique T1068, which covers locally executed malicious code with elevated privileges. This capability enables attackers to perform actions such as installing malicious applications, accessing sensitive personal information, modifying system configurations, or establishing persistent backdoors.
Mitigation strategies for this vulnerability primarily involve applying the official security patch referenced by ALPS07138450, which addresses the specific bounds checking deficiency in the mailbox component. Organizations should implement immediate patch management procedures to ensure all affected devices receive the necessary updates. Additionally, security teams should consider implementing network-based monitoring to detect potential exploitation attempts, particularly focusing on unusual mailbox processing activities or memory allocation patterns. The vulnerability highlights the importance of robust input validation and bounds checking in system components, especially those handling external data inputs. Security practitioners should also consider implementing application whitelisting policies and enhanced memory protection mechanisms such as stack canaries or address space layout randomization to provide additional defense in depth measures. Regular security audits of system components should include thorough examination of memory handling practices to identify similar vulnerabilities that may exist in other parts of the operating system or applications.