CVE-2022-42885

Executive Summary

CVE-2022-42885 is a use of uninitialized pointer vulnerability in the GRO format resolution functionality of Open Babel 3.1.1 and the master commit 530dbfa3. This flaw allows a remote attacker to trigger arbitrary code execution by supplying a specially crafted malformed file to an application that uses the Open Babel library for chemical file format conversion. With a CVSS score of 9.8, the vulnerability is rated critical and poses a significant risk to any organization handling untrusted molecular structure files through Open Babel. As of this report, no official patch or vendor fix is available, making mitigation through input validation and detection controls essential.

Technical Analysis

The vulnerability resides in the GRO format resolution functionality of Open Babel, a widely used open-source cheminformatics toolbox that converts between multiple chemical file formats (SMILES, MOL, SDF, PDB, GRO, etc.). The GRO format (Gromos) is commonly used by molecular dynamics simulation software, and Open Babel's implementation of this importer is the affected component.

The class of vulnerability is a use of uninitialized pointer (CWE-824). This flaw occurs when the program references a pointer variable that has been declared but not properly initialized before use. In the context of the GRO parser, this likely stems from an error-handling path in which a pointer is left in a default/uninitialized state when a malformed input is encountered, and a subsequent code path dereferences this uninitialized pointer. The NVD description does not specify the exact function names or code paths involved, and sufficient technical detail is not available to identify the precise line of code responsible.

From a vulnerability-class perspective, this pattern is dangerous because the behavior of the uninitialized pointer is non-deterministic — it depends on the current state of the stack or heap at the time of execution. If an attacker can influence memory layout sufficiently, the dereference can be redirected to attacker-controlled memory, potentially allowing control-flow hijacking and arbitrary code execution.

The attack surface is the GRO file parser: any application that uses Open Babel to read or convert .gro files is exposed. This includes web services that accept user-uploaded molecular structures, batch processing pipelines in computational chemistry labs, and desktop GUI applications that use Open Babel as a backend. Because Open Babel is a library, the vulnerable code is embedded in all downstream applications that link against it, significantly broadening the attack surface.

The CVSS vector (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H) indicates the vulnerability is remotely exploitable (network vector), requires low attack complexity, no privileges, but requires user interaction (UI:R) — the target user must open or process a malicious GRO file. The scope is changed (S:C), and the impact on confidentiality, integrity, and availability is each rated HIGH.

Exploitation Scenarios

The NVD description specifies that "a specially crafted malformed file can lead to arbitrary code execution" and that "an attacker can provide a malicious file to trigger this vulnerability." No public exploit code or PoC is currently known. The attack chain below is therefore inferred from the vulnerability class and the described delivery mechanism.

Step 1 — Reconnaissance / Target Identification: The attacker identifies targets that process GRO molecular structure files. High-value targets include: cheminformatics web portals that accept file uploads for format conversion (e.g., online .gro-to-PDB converters), scientific computing platforms that batch-process molecular dynamics input files, and desktop environments used by researchers with Open Babel installed. Given that Open Babel is open-source and widely packaged, the attacker may also enumerate systems running vulnerable versions (3.1.1 or master commit 530dbfa3) via version fingerprinting.

Step 2 — Flaw Triggering: The attacker crafts a malformed .gro file designed to place the parser in a state where an uninitialized pointer is dereferenced. Because this is a memory-corruption class bug, the attacker must carefully craft the GRO file structure to exploit the parser's error handling. The file likely contains truncated fields, incorrect header values, or unexpected atom/coordinate counts that force the importer into a code path where a pointer is not properly assigned before use. The crafted file is then delivered to the target, typically via email attachment, web upload, or a shared file repository.

Step 3 — Payload / Execution Method: At the vulnerability-class level, exploitation of a use-of-uninitialized-pointer bug typically proceeds as: (a) the attacker manipulates the program's memory layout (via heap grooming or stack spraying) so that the uninitialized pointer happens to reference attacker-controlled memory; (b) the dereference of that pointer causes the program to read a value from attacker-influenced memory and use it as a function pointer or jump target; (c) control-flow is redirected to shellcode or a ROP chain, leading to arbitrary code execution in the context of the process running Open Babel. It is important to note that without public exploit code, the specific techniques used cannot be confirmed.

Step 4 — Post-Exploitation Impact: Successful exploitation grants the attacker code execution with the privileges of the application using Open Babel. In a web-service scenario, this typically equates to the web server's service account; in a desktop scenario, it equates to the local user. The attacker could then: exfiltrate sensitive research data, pivot to other systems on the network, install persistence mechanisms, or leverage the compromised host as a foothold for lateral movement.

Impact Assessment

Business Impact: This is a critical-severity vulnerability with a CVSS base score of 9.8. The impact on confidentiality, integrity, and availability is rated HIGH across all three dimensions. For organizations in pharmaceutical research, materials science, and computational chemistry, a successful exploitation could result in the theft of proprietary research data, manipulation of simulation inputs, or denial of service to critical computing pipelines.

Affected Systems: All applications and services built on Open Babel 3.1.1 or master commit 530dbfa3 that ingest GRO-format files without pre-validation are at risk. This includes: web-based molecular viewers, batch conversion utilities, and embedded scripts in research workflows. The affected user base is global, as Open Babel is distributed via package managers (apt, conda, Homebrew) across Linux, macOS, and Windows.

Blast Radius: The vulnerability has a changed scope (S:C), meaning the compromise can extend beyond the initial affected component to other resources accessible by the exploited process. Since Open Babel runs with the privileges of the hosting application, the blast radius is proportional to those privileges. In networked deployments where the library runs in a server context with access to databases or shared storage, the downstream impact is significant. EPSS score (0.00802, percentile 53.2%) suggests a moderate-to-low probability of active exploitation in the wild at present, but this is expected to change if a public PoC or exploit kit emerges.

CISA KEV Status: Not listed on CISA's Known Exploited Vulnerabilities catalog, and no evidence of exploitation in the wild has been observed at the time of writing.

Detection Guidance

The following detection rules are designed to identify either the malicious GRO file structure or the anomalous behavior of the Open Babel process during attempted exploitation. Because no public PoC exists, these rules focus on the structural markers of malformed GRO files and on abnormal process behavior.

Sigma Rule

title: Open Babel GRO File Exploitation Attempt
id: 7f3c2a91-8e1a-4d42-9e0b-5a2f1c9d3e7b
status: experimental
description: Detects attempts to trigger CVE-2022-42885 in Open Babel via malformed GRO files
author: Valtersit Threat Intel
date: 2025/01/15
logsource:
  category: process_creation
  product: linux
detection:
  selection:
    Image|endswith:
      - '/obabel'
      - '/babel'
    CommandLine|contains:
      - '.gro'
  anomaly:
    CommandLine|contains:
      - '--errorlevel'
      - '-i gro'
  condition: selection
falsepositives:
  - Legitimate use of Open Babel to convert GRO files
level: medium
tags:
  - attack.t1203
  - cve.2022-42885

Note: This rule detects when Open Babel processes GRO files; refine with additional context such as file origin or parent process to reduce false positives.

YARA Rule

rule OpenBabel_GRO_Malformed_Exploit
{
    meta:
        author = "Valtersit Threat Intel"
        description = "Detects malformed GRO file patterns associated with CVE-2022-42885 attempts"
        cve = "CVE-2022-42885"
        date = "2025-01-15"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2022-42885"
    strings:
        $gro_header = ".gro" ascii wide nocase
        $gro_magic = "GROMOS" ascii wide nocase fullword
        // Common GRO header pattern: residue count followed by residue name
        $gro_residue = /[0-9]{1,5}\s+[A-Z]{1,3}\s+[A-Z]{3}\s+[A-Z0-9]{1,5}/ ascii
        $gro_bad_count = /^\s*[0-9]{4,}/ ascii   // unusually large atom count
    condition:
        uint16(0) == 0x0A0D or uint16(0) == 0x0A0A or
        ($gro_magic and #gro_residue >= 3) or
        ($gro_bad_count and filesize < 1024)
}

Note: This YARA rule is heuristic — it flags structurally suspicious GRO files. Fine-tune thresholds based on legitimate GRO file corpus in your environment.

Suricata IDS Rule

alert http any any -> any any (msg:"ET EXPLOIT Open Babel GRO File Parsing Attempt (CVE-2022-42885)"; flow:established,to_server; file.data; content:".gro"; http.file_name; content:"GROMOS"; file.data; content:"title"; file.data; distance:0; content:"t"; file.data; distance:0; within:100; classtype:attempted-user; sid:3000123; rev:1; metadata:created_at 2025_01_15, cve CVE-2022-42885; priority:1;)

Note: Network-based detection of this vulnerability is challenging because the malicious payload is usually a file uploaded via HTTP/SMTP. This rule monitors for GRO file uploads over HTTP; enhance with file-content inspection if Suricata is configured for file extraction and hashing.

Elastic Detection

// Elastic EQL — detect abnormal Open Babel process behavior
sequence with maxspan=5m
  [ process where process.name == "obabel" and
    event.action == "start" ] by process.pid
  [ process where process.name == "sh" or process.name == "bash" or
    process.name == "python" and
    event.action == "start" ] by process.ppid

// Alternative: detect Open Babel crashing with signal (segfault) while processing GRO files
// This indicates a potential uninitialized-pointer dereference
event.category: process AND
process.name: obabel AND
event.type: end AND
process.exit_code: 139 AND
process.args: *.gro

Splunk SPL Query

index=* sourcetype=process_launch
| where match(process_name, "(?i)obabel|babel")
| search process_args=*.gro
| eval exploit_indicators = if(match(process_args, "errorlevel|repeated|fail"), "HIGH_RISK", "REVIEW")
| stats count by host, process_name, exploit_indicators, _time
| sort - _time

// Detect potential memory-corruption crash
index=* sourcetype=syslog OR sourcetype=linux_messages
| search "segfault" OR "signal 11" OR "core dumped"
| search process_name=obabel OR command=*obabel*
| table _time, host, process_name, message

Wazuh OSSEC Rule

<group name="openbabel,">
    <rule id="100501" level="12">
        <if_sid>571</if_sid>
        <match>obabel|babel</match>
        <regex>\.gro</regex>
        <description>Open Babel processing GRO file — potential CVE-2022-42885 exploitation attempt</description>
        <group>attack.t1203,</group>
        <mitre>
            <id>T1203</id>
        </mitre>
    </rule>

    <rule id="100502" level="15">
        <if_sid>100501</if_sid>
        <match>Segmentation fault|signal 11|core dump</match>
        <description>Open Babel crashed after processing GRO file — suspected uninitialized pointer dereference (CVE-2022-42885)</description>
        <group>attack.t1203,</group>
        <mitre>
            <id>T1203</id>
        </mitre>
    </rule>
</group>

Mitigation & Patch Guidance

Patch Status: Patch confidence is 0/4 — the vulnerability is UNPATCHED. No vendor fix, security advisory, or patched version has been identified from any tracked source. The Open Babel project has not yet released a remediated version.

1) Immediate Mitigations (do these now):

• Input validation: Do not allow untrusted GRO files into any service using Open Babel. Implement a pre-parsing validation step that checks the GRO file structure for anomalies (incorrect header fields, out-of-range coordinate values, atom counts exceeding expected bounds) before passing it to Open Babel.
• Sandboxing / containerization: Run any application that uses Open Babel in an isolated container or sandbox with minimal privileges, strict network egress controls, and read-only filesystem access where possible. Consider using gVisor, Firecracker, or a minimal Alpine container with seccomp profiles.
• Access control: Restrict who can upload GRO files to web-based services. Implement authentication and rate limiting on any file-conversion endpoint.
• Process hardening: Run Open Babel as an unprivileged user (not root). Apply ASLR, stack canaries, and NX (if not already compiled in) by using a hardened build of Open Babel.
• Monitor: Deploy the detection rules above to identify anomalous Open Babel behavior, especially crashes (segfaults) while processing GRO files.

2) Patch / Upgrade Steps:

• Monitor the Open Babel project's GitHub repository (https://github.com/openbabel/openbabel) and mailing list for a security release that addresses CVE-2022-42885.
• When a patched version is released (likely >3.1.1), upgrade immediately. Test the patch in a staging environment to confirm no regression in core conversion functionality.
• Until then, consider pinning to an older version of Open Babel (pre-3.1.1) only if a code audit confirms that version is not affected. Note: this has not been verified and is not recommended as a long-term solution.
• If Open Babel is used as a dependency of another tool (e.g., RDKit, PyBEL, or a GUI app), track the upstream fix through that project's release cycle.

3) Long-Term Hardening:

• Static analysis: The Open Babel project should integrate stronger static analysis tooling (e.g., Clang Static Analyzer, Coverity, or CodeQL) to detect uninitialized-variable and uninitialized-pointer classes of bugs in the file parsers.
• Fuzzing: The project should implement continuous fuzzing of all file-format importers (especially GRO, PDB, MOL, SDF) using libFuzzer or AFL++. A proper fuzzing harness would likely have found this bug before release.
• Memory sanitizers: Build and test Open Babel with MemorySanitizer (MSan) and AddressSanitizer (ASan) enabled in CI to catch use-of-uninitialized-value bugs.
• Deployment hygiene: In enterprise environments, treat all cheminformatics tools that parse user-supplied files as high-risk. Apply the principle of least privilege, use ephemeral compute for batch conversion jobs, and never process untrusted chemical files on production research data servers.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2022-42885 — Official NVD vulnerability description and CVSS scoring.
2. Open Babel GitHub Repository: https://github.com/openbabel/openbabel — Project source code; monitor for future security patches and commits touching the GRO format importer.
3. Open Babel Official Website: https://openbabel.org — Community resources and release announcements.
4. MITRE ATT&CK — T1203: https://attack.mitre.org/techniques/T1203/ — Technique reference for exploitation of client executions (relevant for the client-side parsing scenario).
5. CWE-824 (Use of Uninitialized Pointer): https://cwe.mitre.org/data/definitions/824.html — Weakness class reference describing the underlying bug type.

Threat Actor Campaigns / In-the-Wild Activity: As of this writing, no known threat-actor campaigns or exploitation-in-the-wild evidence is associated with CVE-2022-42885. The CVE is not listed on CISA's Known Exploited Vulnerabilities (KEV) catalog. The EPSS score (0.00802, 53.2% percentile) indicates low-to-moderate exploitation likelihood in the near term. This may change if weaponized exploit code is publicly disclosed or a malicious campaign specifically targets the cheminformatics community.