CVE-2022-44940 in Patchelf
Summary
by MITRE • 12/20/2022
Patchelf v0.9 was discovered to contain an out-of-bounds read via the function modifyRPath at src/patchelf.cc.
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Analysis
by VulDB Data Team • 03/09/2026
The vulnerability CVE-2022-44940 affects patchelf version 0.9 and represents a critical out-of-bounds read condition within the modifyRPath function located in src/patchelf.cc. This flaw occurs when the patchelf utility processes ELF binary files and attempts to modify their runtime search paths. The out-of-bounds read vulnerability arises from insufficient input validation and boundary checking when parsing the dynamic section of ELF files, particularly when handling the rpath or runpath entries that define library search paths for dynamically linked executables.
The technical implementation of this vulnerability stems from the modifyRPath function's failure to properly validate array indices when processing the dynamic tags within ELF binaries. When patchelf encounters a binary with malformed or specially crafted rpath entries, the function attempts to read memory locations beyond the allocated buffer boundaries. This occurs because the code does not adequately verify the length of the rpath string or the number of entries in the dynamic section before attempting to access specific array elements. The vulnerability is classified under CWE-129 as an "Improper Validation of Array Index" and represents a classic example of an out-of-bounds memory access that can lead to information disclosure or potential code execution.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can be exploited by attackers to gain insights into memory layouts or potentially trigger more serious consequences. When patchelf processes compromised binaries or when attackers craft malicious ELF files with malformed rpath entries, the out-of-bounds read can expose sensitive memory contents to unauthorized parties. This vulnerability is particularly concerning in environments where patchelf is used for system administration tasks or during software deployment processes where binaries are modified and restructured. The ATT&CK framework categorizes this as a technique under T1059.001 - Command and Scripting Interpreter and T1552.001 - Unsecured Credentials, as it can enable attackers to extract information that may be used for further exploitation.
Mitigation strategies for CVE-2022-44940 should prioritize immediate patching of affected systems running patchelf version 0.9 or earlier. Organizations should also implement strict input validation measures when processing ELF binaries, particularly in automated environments where patchelf is used extensively. Additional protective measures include deploying runtime monitoring solutions that can detect anomalous memory access patterns and implementing least privilege principles when executing patchelf operations. The vulnerability highlights the importance of proper bounds checking in system utilities that manipulate binary formats and underscores the need for comprehensive security testing of tools that handle low-level file formats. Security teams should also consider implementing binary integrity checks and monitoring for unexpected modifications to system utilities that could indicate exploitation attempts.