CVE-2022-24845: Vyper Integer Bounds Error Vulnerability

HIGH
Advisory Identifier: GHSA-j2x6-9323-fp7h
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CVSS 8.8
CWE-190
Published
Advisory Summary

CVE-2022-24845 is a HIGH (CVSS 8.8) integer bounds error vulnerability (CWE-190: Integer Overflow or Wraparound) affecting Vyper libraries in the PyPI ecosystem. The issue involves integer bounds error in vyper. Remediation is available by upgrading affected packages to version 0.3.2.

CVE-2022-24845 at a Glance

CVE Identifier CVE-2022-24845
GHSA Identifier GHSA-j2x6-9323-fp7h
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification CWE-190: Integer Overflow or Wraparound
Affected Product Vyper
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 8.8

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:R/S:U/C:H/I:H/A:H).

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

How to Fix CVE-2022-24845

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

vyper fixed: 0.3.2 
pip install vyper>=0.3.2
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 vyper

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2022-24845, inspect your installed packages using pip:

pip show vyper

Analyze the terminal output to locate any version of Vyper in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.3.2), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-190: Integer Overflow or Wraparound, where the product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. this occurs when an integer value is incremented to a value that is too large to store in the associated representation. when this occurs, the value may become a very small or negative number. In Vyper, 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

### Impact in the following code, the return of `<iface>.returns_int128()` is not validated to fall within the bounds of `int128`. as of v0.3.0, `<iface>.returns_int128()` is validated in simple expressions, but not complex expressions. ```vyper interface iface: def returns_int128() -> int128: view def returns_Bytes33() -> Bytes[33]: view x: iface @external def call_out(): x: int128 = self.x.returns_int128() # affected, <0.3.0 y: uint256 = convert(self.x.returns_int128(), uint256) # affected, <0.3.2 z: Bytes[33] = concat(self.x.returns_Bytes33(), b"") # affected >= 0.3.0, <0.3.2 ``` ### Patches 0.3.2 (as of https://github.com/vyperlang/vyper/commit/049dbdc647b2ce838fae7c188e6bb09cf16e470b) ### Workarounds Break up operations involving external calls into multiple statements. For instance, instead of the example above, use ``` x: int128 = self.x.returns_int128() y: uint256 = convert(x, uint256) ```

CVE-2022-24845 Affected Vyper Versions

1 component(s)
Fixed Versions:
0.3.2
Product / Package Ecosystem Affected Versions Fixed Version
vyper
pypi/vyper
PyPI
< 0.3.2
0.3.2

References

GitHub Advisory / Wiki ADVISORY
https://github.com/vyperlang/vyper/security/advisories/GHSA-j2x6-9323-fp7h
NVD — CVE-2022-24845 NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-24845
Security Fix Commit FIX COMMIT
https://github.com/vyperlang/vyper/commit/049dbdc647b2ce838fae7c188e6bb09cf16e470b
Vyper Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2022-198.yaml
Vyper Source Repository REPOSITORY
https://github.com/vyperlang/vyper

Frequently Asked Questions

What is CVE-2022-24845?
CVE-2022-24845 is a security vulnerability in Vyper involving Integer bounds error in Vyper under CWE-190: Integer Overflow or Wraparound.
Which Vyper versions are affected?
Affected versions include releases prior to 0.3.2 across affected packages: vyper.
What version fixes CVE-2022-24845?
Upgrading to 0.3.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is vyper affected?
Yes, vyper is affected in releases prior to 0.3.2. Upgrade your dependency to 0.3.2 or later.
What is the CVSS score of CVE-2022-24845?
CVE-2022-24845 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2022-24845?
CVE-2022-24845 is classified under CWE-190: Integer Overflow or Wraparound (The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.).
How can I check PyPI dependencies for CVE-2022-24845?
Run the dependency tree command: 'pip show vyper'. 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-j2x6-9323-fp7h",
  "modified" : "2022-04-22T20:24:13Z",
  "published" : "2022-04-22T20:24:13Z",
  "aliases" : [ "CVE-2022-24845" ],
  "summary" : "Integer bounds error in Vyper",
  "details" : "### Impact\nin the following code, the return of `<iface>.returns_int128()` is not validated to fall within the bounds of `int128`. as of v0.3.0, `<iface>.returns_int128()` is validated in simple expressions, but not complex expressions.\n```vyper\ninterface iface:\n    def returns_int128() -> int128: view\n    def returns_Bytes33() -> Bytes[33]: view\n\nx: iface\n \n@external\ndef call_out():\n    x: int128 = self.x.returns_int128()  # affected, <0.3.0\n    y: uint256 = convert(self.x.returns_int128(), uint256)  # affected, <0.3.2\n    z: Bytes[33] = concat(self.x.returns_Bytes33(), b\"\")  # affected >= 0.3.0, <0.3.2\n```\n\n### Patches\n0.3.2 (as of https://github.com/vyperlang/vyper/commit/049dbdc647b2ce838fae7c188e6bb09cf16e470b)\n\n### Workarounds\nBreak up operations involving external calls into multiple statements. For instance, instead of the example above, use\n```\nx: int128 = self.x.returns_int128()\ny: uint256 = convert(x, uint256)\n```",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "vyper"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/vyperlang/vyper/security/advisories/GHSA-j2x6-9323-fp7h"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2022-24845"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/vyperlang/vyper/commit/049dbdc647b2ce838fae7c188e6bb09cf16e470b"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2022-198.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/vyperlang/vyper"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-190" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-04-22T20:24:13Z",
    "nvd_published_at" : "2022-04-13T22:15:00Z"
  }
}