CVE-2020-5310: Pillow Integer Overflow Vulnerability

CRITICAL
Advisory Identifier: GHSA-vcqg-3p29-xw73
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CVSS 8.8
CWE-190
Published
Advisory Summary

CVE-2020-5310 is a CRITICAL (CVSS 8.8) integer overflow vulnerability (CWE-190: Integer Overflow or Wraparound) affecting Pillow libraries in the PyPI ecosystem. The issue involves integer overflow in pillow. Remediation is available by upgrading affected packages to version 6.2.2.

CVE-2020-5310 at a Glance

CVE Identifier CVE-2020-5310
GHSA Identifier GHSA-vcqg-3p29-xw73
Severity CRITICAL
CVSS v3.1 Base Score 8.8
CWE Classification CWE-190: Integer Overflow or Wraparound
Affected Product Pillow
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-2020-5310

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

pillow fixed: 6.2.2 
pip install pillow>=6.2.2
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 pillow

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2020-5310, inspect your installed packages using pip:

pip show pillow

Analyze the terminal output to locate any version of Pillow in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.2.2), your application is affected.

Note: The pip show pillow 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 Pillow, 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

`libImaging/TiffDecode.c` in Pillow before 6.2.2 has a TIFF decoding integer overflow, related to realloc.

CVE-2020-5310 Affected Pillow Versions

1 component(s)
Fixed Versions:
6.2.2
Product / Package Ecosystem Affected Versions Fixed Version
pillow
pypi/pillow
PyPI
< 6.2.2
6.2.2

References

NVD — CVE-2020-5310 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-5310
Security Fix Commit FIX COMMIT
https://github.com/python-pillow/Pillow/commit/4e2def2539ec13e53a82e06c4b3daf00454100c4
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-vcqg-3p29-xw73
Pillow Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2020-81.yaml
Pillow Source Repository REPOSITORY
https://github.com/pypa/advisory-db/blob/7872b0a91b4d980f749e6d75a81f8cc1af32829f/vulns/pillow/PYSEC-2020-81.yaml
Pillow Source Repository REPOSITORY
https://github.com/python-pillow/Pillow
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2MMU3WT2X64GS5WHDPKKC2WZA7UIIQ3A
lists.fedoraproject.org/archives/list/packa... WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3DUMIBUYGJRAVJCTFUWBRLVQKOUTVX5P
Pillow Release RELEASE
https://pillow.readthedocs.io/en/stable/releasenotes/6.2.2.html
usn.ubuntu.com/4272-1 WEB
https://usn.ubuntu.com/4272-1

Frequently Asked Questions

What is CVE-2020-5310?
CVE-2020-5310 is a security vulnerability in Pillow involving Integer overflow in Pillow under CWE-190: Integer Overflow or Wraparound.
Which Pillow versions are affected?
Affected versions include releases prior to 6.2.2 across affected packages: pillow.
What version fixes CVE-2020-5310?
Upgrading to 6.2.2 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pillow affected?
Yes, pillow is affected in releases prior to 6.2.2. Upgrade your dependency to 6.2.2 or later.
What is the CVSS score of CVE-2020-5310?
CVE-2020-5310 has a CVSS v3.1 base score of 8.8 (CRITICAL) 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-2020-5310?
CVE-2020-5310 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-2020-5310?
Run the dependency tree command: 'pip show pillow'. 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-vcqg-3p29-xw73",
  "modified" : "2024-10-08T13:03:45Z",
  "published" : "2021-11-03T18:04:41Z",
  "aliases" : [ "CVE-2020-5310" ],
  "summary" : "Integer overflow in Pillow",
  "details" : "`libImaging/TiffDecode.c` in Pillow before 6.2.2 has a TIFF decoding integer overflow, related to realloc.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "pillow"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "6.2.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-5310"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/python-pillow/Pillow/commit/4e2def2539ec13e53a82e06c4b3daf00454100c4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-vcqg-3p29-xw73"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2020-81.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-db/blob/7872b0a91b4d980f749e6d75a81f8cc1af32829f/vulns/pillow/PYSEC-2020-81.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/python-pillow/Pillow"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2MMU3WT2X64GS5WHDPKKC2WZA7UIIQ3A"
  }, {
    "type" : "WEB",
    "url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3DUMIBUYGJRAVJCTFUWBRLVQKOUTVX5P"
  }, {
    "type" : "WEB",
    "url" : "https://pillow.readthedocs.io/en/stable/releasenotes/6.2.2.html"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/4272-1"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-190" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-11-03T17:23:34Z",
    "nvd_published_at" : "2020-01-03T01:15:00Z"
  }
}