CVE-2023-46960: PyPXE PyPXE Buffer Overflow Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-82wx-rxf8-fxch
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CVSS 8.6
CWE-120
Published
Advisory Summary

CVE-2023-46960 is a HIGH (CVSS 8.6) pypxe buffer overflow vulnerability vulnerability (CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')) affecting PyPXE libraries in the PyPI ecosystem. The issue involves pypxe buffer overflow vulnerability. Remediation is available in the latest vendor maintenance releases.

CVE-2023-46960 at a Glance

CVE Identifier CVE-2023-46960
GHSA Identifier GHSA-82wx-rxf8-fxch
Severity HIGH
CVSS v3.1 Base Score 8.6
CWE Classification CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Affected Product PyPXE
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.6

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:L/I:L/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 Low (C:L)
Integrity Low (I:L)
Availability High (A:H)

How to Fix CVE-2023-46960

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

PyPXE fixed: Latest secure release 
pip install PyPXE>=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 PyPXE

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2023-46960, inspect your installed packages using pip:

pip show PyPXE

Analyze the terminal output to locate any version of PyPXE 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 PyPXE command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow'), where the product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. In PyPXE, 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

Buffer Overflow vulnerability in PyPXE v.1.8.4 allows a remote attacker to cause a denial of service via the handle function in the tftp module.

CVE-2023-46960 Affected PyPXE Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
PyPXE
pypi/PyPXE
PyPI
≤ 1.8.4

References

NVD — CVE-2023-46960 NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-46960
PyPXE Source Repository REPOSITORY
https://github.com/pypxe/PyPXE/issues/206
PyPXE Source Repository REPOSITORY
https://github.com/pypxe/PyPXE

Frequently Asked Questions

What is CVE-2023-46960?
CVE-2023-46960 is a security vulnerability in PyPXE involving PyPXE Buffer Overflow vulnerability under CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow').
Which PyPXE versions are affected?
Affected versions include releases prior to current release patches across affected packages: PyPXE.
What version fixes CVE-2023-46960?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is PyPXE affected?
Yes, PyPXE 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-2023-46960?
CVE-2023-46960 has a CVSS v3.1 base score of 8.6 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H.
What CWE is associated with CVE-2023-46960?
CVE-2023-46960 is classified under CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') (The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.).
How can I check PyPI dependencies for CVE-2023-46960?
Run the dependency tree command: 'pip show PyPXE'. 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-82wx-rxf8-fxch",
  "modified" : "2024-08-02T16:10:15Z",
  "published" : "2024-04-29T21:30:35Z",
  "aliases" : [ "CVE-2023-46960" ],
  "summary" : "PyPXE Buffer Overflow vulnerability",
  "details" : "Buffer Overflow vulnerability in PyPXE v.1.8.4 allows a remote attacker to cause a denial of service via the handle function in the tftp module.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "PyPXE"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.8.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-46960"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypxe/PyPXE/issues/206"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pypxe/PyPXE"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-120" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-08-02T16:10:15Z",
    "nvd_published_at" : "2024-04-29T21:15:47Z"
  }
}