CyberSecBulletin
CVE-2024-45409NVD status: Modified

ruby-saml: Improper Verification of Cryptographic Signature

Published Updated By the CyberSecBulletin desk

CVE-2024-45409 is a critical-severity improper verification of cryptographic signature vulnerability in ruby-saml from SAML-Toolkits, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected ruby-saml versions: < 1.12.3; >= 1.13.0, < 1.17.0. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 12.5% chance of exploitation within 30 days, which is in the top 3.72% of all scored CVEs.

Patch this week

Critical severity: a successful attack would have severe impact.

What to do

  1. Update ruby-saml to 1.12.3 or 1.17.0, whichever matches your release line, or a later version.
  2. Update Gitlab to 16.11.10 or 17.0.8 or 17.1.8 or 17.2.7, whichever matches your release line, or a later version.
  3. Read the advisory on github.com for workarounds and exact fixed builds.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
SAML-Toolkitsruby-saml< 1.12.3; >= 1.13.0, < 1.17.0Not stated
Oneloginruby-samlbefore 1.12.3; 1.13.0 up to, but not including, 1.17.01.12.3, 1.17.0
Omniauthomniauth-saml2.1.0 and earlierNot stated
GitLabGitlabbefore 16.11.10; 17.0.0 up to, but not including, 17.0.8; 17.1.0 up to, but not including, 17.1.8; 17.2.0 up to, but not including, 17.2.7; 17.3.0 up to, but not including, 17.3.316.11.10, 17.0.8, 17.1.8, 17.2.7, 17.3.3

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.

Scoring systemScoreSeverityScored by
CVSS 3.110.0CriticalCNA (github.com)
CVSS 3.19.8CriticalNVD

Official description

The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in <= 12.2 and 1.13.0 <= 1.16.0 does not properly verify the signature of the SAML Response. An unauthenticated attacker with access to any signed saml document (by the IdP) can thus forge a SAML Response/Assertion with arbitrary contents. This would allow the attacker to log in as arbitrary user within the vulnerable system. This vulnerability is fixed in 1.17.0 and 1.12.3.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Verification of Cryptographic Signature

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

More Improper Verification of Cryptographic Signature vulnerabilities (CWE-347)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: poc, automatable: yes, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in ruby-saml

All ruby-saml vulnerabilities

Recent Improper Verification of Cryptographic Signature vulnerabilities

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