CVE-2022-0630 in mruby
Summary
by MITRE • 02/19/2022
Out-of-bounds Read in Homebrew mruby prior to 3.2.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 06/13/2026
The vulnerability under examination involves an out-of-bounds read condition affecting the mruby interpreter version prior to 3.2 within the Homebrew package ecosystem. This flaw exists in the core interpreter functionality where memory access occurs beyond the allocated boundaries of allocated memory segments. The vulnerability manifests when the interpreter processes certain input sequences that trigger improper bounds checking during array or string operations. Such out-of-bounds memory access can lead to unpredictable behavior including potential information disclosure, application crashes, or in severe cases, arbitrary code execution depending on the specific memory layout and exploitation circumstances.
The technical root cause stems from insufficient validation of array indices and memory access boundaries within the mruby implementation. When processing user-supplied input or code snippets, the interpreter fails to properly validate that array access operations remain within legitimate memory limits. This allows attackers to craft malicious input that causes the interpreter to read memory locations beyond the intended data structures. The vulnerability can be triggered through various code patterns including improper array indexing, string manipulation operations, or when handling malformed data structures within the mruby runtime environment. The flaw specifically impacts the memory management subsystem where bounds checking mechanisms are either absent or inadequately implemented.
The operational impact of this vulnerability extends across multiple threat scenarios within the Homebrew ecosystem where mruby is utilized. Attackers could exploit this condition to gain unauthorized access to sensitive memory regions potentially containing credentials, temporary data, or other confidential information. The vulnerability creates opportunities for denial of service attacks that could disrupt legitimate Homebrew package installations or script executions. In more sophisticated exploitation scenarios, the out-of-bounds read could enable attackers to manipulate memory contents or potentially achieve remote code execution depending on the specific environment and memory layout. This vulnerability affects all systems running Homebrew with mruby versions earlier than 3.2, creating widespread exposure across the user base.
Mitigation strategies for this vulnerability involve immediate upgrade to mruby version 3.2 or later where the bounds checking mechanisms have been properly implemented and validated. System administrators should prioritize patching affected installations and monitoring for any suspicious activity that might indicate exploitation attempts. Additional defensive measures include implementing runtime memory protection mechanisms such as address space layout randomization and stack canaries to make exploitation more difficult. Input validation should be strengthened at all levels where mruby scripts are executed, particularly when processing untrusted data. The vulnerability aligns with CWE-129 which specifically addresses insufficient validation of length of inputs and CWE-787 which covers out-of-bounds write operations, though the specific manifestation here involves read operations. From an attack perspective, this vulnerability maps to techniques described in the attack pattern taxonomy under code injection and memory corruption categories, representing a fundamental security weakness in the interpreter's memory management implementation that requires immediate remediation to prevent potential exploitation across the Homebrew ecosystem.