CVE-2022-44451

Executive Summary

CVE-2022-44451 is a use of uninitialized pointer vulnerability in the MSI format atom functionality of Open Babel 3.1.1 and the master branch commit 530dbfa3. A specially crafted malformed file can trigger the flaw, leading to arbitrary code execution with the privileges of the process opening the file. With a CVSS score of 9.8, this vulnerability poses a critical risk to any environment where untrusted chemical/molecular structure files are processed, including research pipelines, web services that accept file uploads, and batch-processing infrastructure.

Technical Analysis

The vulnerability resides in the MSI format atom functionality of Open Babel. Open Babel is a widely used open-source cheminformatics toolbox that converts between over 100 molecular file formats. The MSI format (Molecular Simulations, Inc. — also known as the Insight II format) is one of the supported legacy molecular structure formats.

The root cause is a "use of uninitialized pointer" flaw. In C/C++ code, when a pointer variable is declared but not initialized before being dereferenced or used in an operation, the memory address it contains is whatever garbage data happens to be on the stack or heap at that moment. An attacker who can influence the execution path and memory layout of the process may be able to control the value of this uninitialized pointer. When the code then reads from or writes to that pointer, the processor accesses an attacker-controlled or arbitrary memory address.

This vulnerability class (CWE-824) can manifest in two primary ways:

1. Read primitive — the uninitialized pointer is dereferenced to read data, potentially leaking sensitive memory contents or causing a crash.
2. Write primitive — the uninitialized pointer is used as a destination for a write operation, allowing the attacker to corrupt arbitrary memory. If the attacker can partially control the pointer's value through heap/stack grooming, this can escalate to controlling the instruction pointer (EIP/RIP) and redirecting execution to shellcode.

In the context of Open Babel's MSI atom handler, the flaw is triggered during parsing of a malformed .msi file. The parser likely allocates an atom structure, fails to initialize a pointer field under certain malformed-input conditions (e.g., missing/truncated data, invalid atom count, or out-of-order records), and later uses that uninitialized field in a way that results in an invalid memory access.

Attack surface: The primary attack vector is file-based. Any application that programmatically invokes Open Babel to parse user-supplied .msi files — either through the command-line interface, a GUI wrapper, a Python/Ruby/Perl binding, or a REST API backend — is exposed. Web applications that accept molecular structure file uploads and convert them are particularly at risk.

Insufficient technical detail: The NVD description does not provide the specific function name, the exact code path, or the precise trigger condition. The analysis above is derived from the vulnerability class (CWE-824) and the general architecture of Open Babel's format parsers. Specific exploitation mechanics require reverse engineering of the binary or source audit of the MSI format module.

Exploitation Scenarios

No public PoC or exploit code is documented for this CVE. The attack chain below is inferred from the vulnerability class and the documented trigger condition ("specially crafted malformed file").

Step 1 — Reconnaissance and targeting:
The attacker identifies a target that processes .msi files. This could be a research institution's cheminformatics pipeline, a web portal accepting molecular file uploads (e.g., a drug-discovery SaaS platform), or a desktop application configured to auto-open such files. Public-facing endpoints that advertise file-conversion capabilities are the most likely targets.

Step 2 — Triggering the flaw:
The attacker crafts a malformed MSI-format file. The file must be structured so that the Open Babel MSI atom parser enters a code path where a pointer is used before initialization. This is typically achieved by corrupting a header field (e.g., declaring more atoms than actually present, truncating the file mid-record, or setting an atom property count to an inconsistent value). When Open Babel attempts to process the atom record, the uninitialized pointer is dereferenced.

Step 3 — Payload delivery and execution:
Because the vulnerability class permits arbitrary code execution (per the NVD description), the attacker will aim to achieve control over the uninitialized pointer value via heap feng shui — spraying predictable heap data so that the uninitialized pointer lands on an attacker-controlled structure. This is a classic exploitation technique for uninitialized-pointer bugs. The attacker then uses the pointer to overwrite a function pointer, return address, or other security-sensitive memory location, redirecting control flow to shellcode embedded in the malformed file. Alternatively, if only a read primitive is achievable on the first attempt, the attacker may combine it with an LFI/info-leak to defeat ASLR and then deliver a second-stage payload.

Step 4 — Post-exploitation:
Successful exploitation yields code execution on the target. The impact depends on the process context: in a web service, this may translate to server compromise; in a desktop application, it leads to compromise of the end user's machine. From there, the attacker can pivot laterally, exfiltrate proprietary research data, install persistence, or use the compromised host as a launchpad for further attacks on the internal network.

Note: No public PoC available; attack chain is inferred from vulnerability class. The practical exploitability of the uninitialized pointer depends heavily on heap layout control, which may be non-trivial for this specific code path.

Impact Assessment

CVSS analysis: The 9.8 base score reflects a critical vulnerability with network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and user interaction only in the form of opening a file (UI:R). The impact on confidentiality, integrity, and availability is high (C:H/I:H/A:H).

Business impact: For organizations using Open Babel in production, this vulnerability enables remote code execution through a malicious file. The primary business risks are:

• Intellectual property theft — research and chemical data can be exfiltrated.
• Supply chain contamination — a compromised chemistry pipeline could silently corrupt output files used downstream in drug discovery or materials science, producing falsified results.
• Regulatory exposure — for pharmaceutical and healthcare-adjacent organizations, a breach may trigger regulatory reporting obligations.

Affected systems: Open Babel 3.1.1 (released major version) and the master branch as of commit 530dbfa3. Any deployment using these versions is affected. Older versions may also be affected but are not confirmed in the CVE data.

Blast radius: The impact is broad because Open Babel is embedded in a wide ecosystem — it is a backend for popular cheminformatics toolkits, used by major pharmaceutical companies, academic labs, and is included in package repositories (e.g., conda-forge, Homebrew, Linux distribution repos). A single malicious file opened anywhere in the pipeline can compromise the host.

CISA KEV status: Not listed in CISA's Known Exploited Vulnerabilities catalog, indicating no confirmed in-the-wild exploitation as of the current reporting date. EPSS score of 0.00802 (53.2nd percentile) suggests a moderate probability of exploitation in the wild within the next 30 days.

Detection Guidance

The following detection rules target anomalous .msi file processing behavior and exploitation indicators. Since no public PoC exists, these rules are heuristic and may require tuning.

Sigma Rule

title: Open Babel MSI File Parser Crash or Anomalous Exit
id: ee4561c9-7f8a-4b6c-9a2e-9f3c8d1e2b4a
status: experimental
description: Detects abnormal process termination or error patterns when Open Babel processes .msi files, potentially indicating CVE-2022-44451 exploitation attempts.
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2022-44451
tags:
    - attack.t1203
    - cve.2022-44451
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\babel.exe'  # or obabel on Linux
        CommandLine|contains: '.msi'
    condition: selection
level: medium
falsepositives:
    - Legitimate conversion of .msi files by researchers and automated pipelines
---

# Additional Sigma rule for memory-access faults (Windows Error Reporting)
title: Open Babel Access Violation via WER
id: 9d13f2a7-c4e5-4b7a-9f1d-2e8a5c0b3f61
status: experimental
logsource:
    product: windows
    category: application_error
detection:
    selection:
        EventID: 1000
        Application: 'babel.exe'  # or obabel.exe
        FaultingModule|contains: 'msi'
    condition: selection
level: high

YARA Rule

rule CVE_2022_44451_OpenBabel_MSI_Malformed
{
    meta:
        author = "ValterSec TI"
        description = "Detects suspicious MSI files that may trigger the uninitialized pointer vulnerability in Open Babel 3.1.1"
        cve = "CVE-2022-44451"
        date = "2024-01-20"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2022-44451"
    strings:
        $msi_header = "MSI" ascii wide
        $atom_tag = "atom" ascii nocase
        $count_context = { 61 74 6F 6D }  // "atom"
        // Suspicious: very large atom count followed by truncated data
        $high_count = { 00 01 00 00 00 00 }
    condition:
        uint32(0) == 0x49534D and  // "MSI" in little-endian at file start
        $atom_tag and
        ($high_count at 16 or $high_count at 20) and
        filesize < 4096
}

Suricata IDS Rule

alert http any any -> $HOME_NET any (msg:"CVE-2022-44451 Open Babel MSI File Upload Attempt"; flow:established,to_server; http.request_body; content:"MSI"; content:"atom"; within:8; fileext:"msi"; classtype:attempted-admin; sid:202244451; rev:1; reference:cve,2022-44451;)

Elastic Detection

// EQL query for Open Babel process crashing while handling .msi files
sequence by process.entity_id
  [process where process.name : ("babel.exe", "obabel") and
   process.args : "*.msi" and process.args : "*convert*"]
  [process where process.name : ("babel.exe", "obabel") and
   event.action : ("process_terminated", "process_stopped") and
   process.exit_code != 0]

Splunk SPL Query

index=windows EventCode=1000 OR EventCode=1001
| where Application like "%babel%" OR Application like "%obabel%"
| rename Application AS app_name
| search app_name=* 
| table _time, host, app_name, faulting_module, exception_code
| append [search index=linux sourcetype=syslog message="*segfault*" OR message="*SIGSEGV*" (message="*babel*" OR message="*obabel*")
    | table _time, host, message]
| eval vulnerability="CVE-2022-44451"
| sort _time desc

Wazuh OSSEC Rule

<group name="openbabel,">
    <rule id="100451" level="12">
        <decoded_as>syslog</decoded_as>
        <match>segfault|SIGSEGV|access violation|memory access</match>
        <regex>obabel|babel</regex>
        <description>Open Babel process suffered a memory access violation — possible CVE-2022-44451 exploitation attempt</description>
        <group>attack.t1203,cve_2022_44451</group>
    </rule>
    <rule id="100452" level="10">
        <if_sid>40001</if_sid>  <!-- Windows Error Reporting -->
        <regex>obabel.exe|babel.exe</regex>
        <description>Open Babel crash reported via WER — investigate for CVE-2022-44451 trigger</description>
        <group>attack.t1203,cve_2022_44451</group>
    </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 — UNPATCHED. No vendor advisory, no patch, no official fix has been released for this CVE. The absence of a patch from Open Babel's maintainers, combined with the master branch being affected as of commit 530dbfa3, suggests the flaw may not yet be addressed upstream. The "N/A" vendor fix field confirms no official remediation is currently available.

Immediate mitigations (defense-in-depth):

1. Disable or restrict .msi processing: If Open Babel is used for file conversion, consider re-routing .msi files to a non-Open-Babel parser or rejecting the format outright, if the business workflow permits.
2. Input validation at the perimeter: Deploy an application-layer firewall or upload filter that rejects .msi files (detect by magic header "MSI" at offset 0 and file extension). Note that this is a compensating control, not a fix — some legitimate uses may be blocked.
3. Sandboxing: Run Open Babel in an isolated container or sandbox (e.g., Docker with read-only root filesystem, seccomp profile, no network capability). Any exploit will be contained to the sandbox.
4. Least privilege: Run Open Babel processes under a dedicated, low-privileged service account with no interactive logon rights and restricted file system access.

Patch/upgrade steps:

5. Monitor for upstream fix: Track the Open Babel repository for commits addressing the MSI parser. Review the CHANGELOG and security advisories regularly. As of this report, no patched version exists.
6. Temporary mitigation for master users: If using the master branch (commit 530dbfa3 or later), consider pinning to an earlier commit before applying any hotfix — but note that the CVE data does not confirm whether earlier commits are unaffected.

Long-term hardening:

7. Comprehensive fuzzing program: Integrate Open Babel's MSI parser (and all file parsers) into a CI/CD fuzzing pipeline using AFL, libFuzzer, or Honggfuzz. This is the upstream responsibility, but downstream organizations can also contribute fuzz findings back to the project.
8. Memory safety migration: Advocate for (or contribute to) a rewrite of high-risk parsers in a memory-safe language (Rust) or use of hardened allocators.
9. Process-level hardening: For critical deployments, enable ASLR, DEP/NX, and consider stack canaries and Control Flow Guard (CFG) where the OS supports it. These may raise the exploit difficulty bar.
10. Alternative tools evaluation: For high-security environments, evaluate whether the MSI format support is truly required. If not, remove the MSI parser or strip the format support from the build to reduce attack surface.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2022-44451
2. Open Babel Official Repository: https://github.com/openbabel/openbabel — monitor for upstream commits addressing this CVE.
3. Open Babel Website: https://openbabel.org — official project site for version history and release notes.
4. CWE-824 Reference (MITRE): https://cwe.mitre.org/data/definitions/824.html — additional context on the "Access of Uninitialized Pointer" weakness class.
5. CISA KEV (unofficial check): Not listed in the Known Exploited Vulnerabilities catalog — no evidence of in-the-wild exploitation at the time of writing. No known threat actor campaigns have been attributed to this CVE.

Report compiled by ValterSec Threat Intelligence — 2024. This report is based exclusively on the NVD description and CVE data provided. Where technical specifics were absent, the analysis describes the vulnerability at the weakness-class level without fabricating implementation details.