CVE-2022-27824 in libsapeextractor
Summary
by MITRE • 04/12/2022
Improper size check of in sapefd_parse_meta_DESCRIPTION function of libsapeextractor library prior to SMR Apr-2022 Release 1 allows out of bounds read via a crafted media file
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Analysis
by VulDB Data Team • 04/14/2022
The vulnerability identified as CVE-2022-27824 represents a critical security flaw within the libsapeextractor library, specifically within the sapefd_parse_meta_DESCRIPTION function. This issue affects systems utilizing the SMR Apr-2022 Release 1 and earlier versions, where improper size validation mechanisms fail to adequately verify the boundaries of data structures during media file processing. The flaw manifests as an out-of-bounds read condition that can be triggered by supplying a maliciously crafted media file to the affected software components. This vulnerability falls under the category of buffer over-read conditions, which are commonly classified as CWE-125 in the Common Weakness Enumeration catalog, representing an out-of-bounds read vulnerability where an attacker can access memory locations beyond the intended buffer boundaries.
The technical implementation of this vulnerability occurs when the sapefd_parse_meta_DESCRIPTION function processes metadata within media files without proper validation of the expected data size. During normal operation, the function expects specific data structures with predetermined boundaries, but when confronted with crafted input that exceeds these expected dimensions, the parsing logic fails to enforce size constraints. This failure allows the program to read memory locations that extend beyond the allocated buffer, potentially exposing sensitive information or enabling further exploitation techniques. The out-of-bounds read can lead to information disclosure, application instability, or in some cases, facilitate more sophisticated attacks such as code execution through subsequent exploitation vectors.
From an operational perspective, this vulnerability poses significant risks to organizations relying on media processing systems that utilize the affected library. Attackers can exploit this weakness by preparing specially crafted media files that trigger the vulnerable parsing function, potentially leading to unauthorized data access or system compromise. The impact extends beyond simple information disclosure as the vulnerability could be leveraged in combination with other exploits to achieve remote code execution or privilege escalation within affected systems. The nature of media file processing makes this vulnerability particularly dangerous in environments where users can upload or process external media content, as it provides a potential entry point for attackers to gain unauthorized access to systems.
Mitigation strategies for CVE-2022-27824 primarily focus on updating to the patched version of the SMR Apr-2022 Release 1 or later, which includes proper size validation mechanisms within the sapefd_parse_meta_DESCRIPTION function. Organizations should implement comprehensive patch management procedures to ensure all affected systems receive the necessary updates promptly. Additional defensive measures include input validation at multiple layers, implementing strict content filtering for media files, and deploying intrusion detection systems that can identify suspicious file processing activities. The vulnerability demonstrates the importance of proper bounds checking and memory safety practices in software development, aligning with ATT&CK technique T1059.007 for execution through media files and T1566 for initial access through spearphishing attachments. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation attempts.