CVE-2019-16228: Lmdb Py-lmdb Divide By Zero Interruptions Vulnerability

HIGH
Advisory Identifier: GHSA-ggwq-vrgp-6gv4
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CVSS 7.5
CWE-369
Published
Advisory Summary

CVE-2019-16228 is a HIGH (CVSS 7.5) py-lmdb divide by zero interruptions vulnerability (CWE-369: Divide By Zero) affecting Lmdb libraries in the PyPI ecosystem. The issue involves py-lmdb divide by zero interruptions. Remediation is available in the latest vendor maintenance releases.

CVE-2019-16228 at a Glance

CVE Identifier CVE-2019-16228
GHSA Identifier GHSA-ggwq-vrgp-6gv4
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-369: Divide By Zero
Affected Product Lmdb
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2019-16228

To remediate this vulnerability, upgrade all affected Lmdb dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

lmdb fixed: Latest secure release 
pip install lmdb>=Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show lmdb

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2019-16228, inspect your installed packages using pip:

pip show lmdb

Analyze the terminal output to locate any version of Lmdb in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The pip show lmdb command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-369: Divide By Zero, where the product divides a value by zero. In Lmdb, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An issue was discovered in py-lmdb 0.97. There is a divide-by-zero error in the function mdb_env_open2 if mdb_env_read_header obtains a zero value for a certain size field.

CVE-2019-16228 Affected Lmdb Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
lmdb
pypi/lmdb
PyPI
≤ 0.97

References

NVD — CVE-2019-16228 NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-16228
Lmdb Source Repository REPOSITORY
https://github.com/TeamSeri0us/pocs/tree/master/lmdb/FPE
Lmdb Source Repository REPOSITORY
https://github.com/jnwatson/py-lmdb
Lmdb Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/lmdb/PYSEC-2019-240.yaml
pypi.org/project/lmdb WEB
https://pypi.org/project/lmdb

Frequently Asked Questions

What is CVE-2019-16228?
CVE-2019-16228 is a security vulnerability in Lmdb involving py-lmdb Divide by Zero interruptions under CWE-369: Divide By Zero.
Which Lmdb versions are affected?
Affected versions include releases prior to current release patches across affected packages: lmdb.
What version fixes CVE-2019-16228?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is lmdb affected?
Yes, lmdb is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2019-16228?
CVE-2019-16228 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2019-16228?
CVE-2019-16228 is classified under CWE-369: Divide By Zero (The product divides a value by zero.).
How can I check PyPI dependencies for CVE-2019-16228?
Run the dependency tree command: 'pip show lmdb'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-ggwq-vrgp-6gv4",
  "modified" : "2024-09-30T16:40:25Z",
  "published" : "2022-05-24T16:55:56Z",
  "aliases" : [ "CVE-2019-16228" ],
  "summary" : "py-lmdb Divide by Zero interruptions",
  "details" : "An issue was discovered in py-lmdb 0.97. There is a divide-by-zero error in the function mdb_env_open2 if mdb_env_read_header obtains a zero value for a certain size field.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "lmdb"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.97"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2019-16228"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/TeamSeri0us/pocs/tree/master/lmdb/FPE"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jnwatson/py-lmdb"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/lmdb/PYSEC-2019-240.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://pypi.org/project/lmdb"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-369" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-04-22T22:36:08Z",
    "nvd_published_at" : "2019-09-11T15:15:00Z"
  }
}