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cvelistGitHub_MCVELIST:CVE-2023-40165
HistoryAug 17, 2023 - 5:06 p.m.

CVE-2023-40165 Unauthorized gem replacement for full names ending in numbers on rubygems.org

2023-08-1717:06:32
CWE-20
GitHub_M
www.cve.org
rubygems
platform validation
cdn purge
gem storage
checksum
validation
input validation
gem replacement
malicious actors
vulnerability
patching
local gems
user validation

7.4 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N

0.0005 Low

EPSS

Percentile

17.2%

rubygems.org is the Ruby community’s primary gem (library) hosting service. Insufficient input validation allowed malicious actors to replace any uploaded gem version that had a platform, version number, or gem name matching /-\d/, permanently replacing the legitimate upload in the canonical gem storage bucket, and triggering an immediate CDN purge so that the malicious gem would be served immediately. The maintainers have checked all gems matching the /-\d/ pattern and can confirm that no unexpected .gems were found. As a result, we believe this vulnerability was not exploited. The easiest way to ensure that a user’s applications were not exploited by this vulnerability is to check that all of your downloaded .gems have a checksum that matches the checksum recorded in the RubyGems.org database. RubyGems contributor Maciej Mensfeld wrote a tool to automatically check that all downloaded .gem files match the checksums recorded in the RubyGems.org database. You can use it by running: bundle add bundler-integrity followed by bundle exec bundler-integrity. Neither this tool nor anything else can prove you were not exploited, but the can assist your investigation by quickly comparing RubyGems API-provided checksums with the checksums of files on your disk. The issue has been patched with improved input validation and the changes are live. No action is required on the part of the user. Users are advised to validate their local gems.

CNA Affected

[
  {
    "vendor": "rubygems",
    "product": "rubygems.org",
    "versions": [
      {
        "version": "< 2023-08-14",
        "status": "affected"
      }
    ]
  }
]

7.4 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N

0.0005 Low

EPSS

Percentile

17.2%

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