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CVE-2022-29176— Unauthorized gem takeover for some gems on rubygems.org

Quick assessment

Affected
rubygems rubygems.org
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

RubyGems是RubyGems组织的一款Ruby程序包管理器。该产品主要用于发布和管理Ruby程序包。 RubyGems 存在安全漏洞，该漏洞源于yank操作中的错误，任何RubyGems.org用户都可以删除和替换某些gem。

CVSS 9.9 · Critical EPSS 1.94% · P79
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I. Basic Information for CVE-2022-29176

Vulnerability Information
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Vulnerability Title
Unauthorized gem takeover for some gems on rubygems.org
Source: CVE Program / CVE List V5
Vulnerability Description
Rubygems is a package registry used to supply software for the Ruby language ecosystem. Due to a bug in the yank action, it was possible for any RubyGems.org user to remove and replace certain gems even if that user was not authorized to do so. To be vulnerable, a gem needed: one or more dashes in its name creation within 30 days OR no updates for over 100 days At present, we believe this vulnerability has not been exploited. RubyGems.org sends an email to all gem owners when a gem version is published or yanked. We have not received any support emails from gem owners indicating that their gem has been yanked without authorization. An audit of gem changes for the last 18 months did not find any examples of this vulnerability being used in a malicious way. A deeper audit for any possible use of this exploit is ongoing, and we will update this advisory once it is complete. Using Bundler in --frozen or --deployment mode in CI and during deploys, as the Bundler team has always recommended, will guarantee that your application does not silently switch to versions created using this exploit. To audit your application history for possible past exploits, review your Gemfile.lock and look for gems whose platform changed when the version number did not change. For example, gemname-3.1.2 updating to gemname-3.1.2-java could indicate a possible abuse of this vulnerability. RubyGems.org has been patched and is no longer vulnerable to this issue as of the 5th of May 2022.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
RubyGems 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
RubyGems是RubyGems组织的一款Ruby程序包管理器。该产品主要用于发布和管理Ruby程序包。 RubyGems 存在安全漏洞，该漏洞源于yank操作中的错误，任何RubyGems.org用户都可以删除和替换某些gem。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rubygems rubygems.org n/a -

II. Public POCs for CVE-2022-29176

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III. Intelligence Information for CVE-2022-29176

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Vendor Advisories for CVE-2022-29176 (2)

Other References for CVE-2022-29176 (1)

IV. Related Vulnerabilities

Same product: rubygems.org
Same vendor: rubygems
Same weakness: CWE-862

V. Comments for CVE-2022-29176

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