CVE-2024-27256 Overview
CVE-2024-27256 is a cryptographic weakness affecting IBM MQ Container and IBM MQ Operator deployments. The flaw stems from the use of weaker-than-expected cryptographic algorithms, which an attacker positioned to capture protected traffic or data could leverage to decrypt highly sensitive information [CWE-327]. The vulnerability impacts IBM MQ Container 3.0.0, 3.0.1, 3.1.0 through 3.1.3 CD, 2.0.0 LTS through 2.0.22 LTS, 2.4.0 through 2.4.8, 2.3.0 through 2.3.3, and 2.2.0 through 2.2.2. IBM published the advisory and corrective guidance for affected operator and container image versions.
Critical Impact
Network-based attackers without authentication can potentially break the weak cryptography protecting MQ traffic, exposing confidential message contents and sensitive operational data.
Affected Products
- IBM MQ Operator (versions covering LTS and CD streams, including 3.0.0 and 3.0.1 CD)
- IBM Supplied MQ Advanced Container Images (multiple 9.2.x and 9.3.x releases across LTS, EUS, and CD)
- IBM MQ Container 2.x LTS, 2.2.x through 2.4.x, and 3.0.x through 3.1.x CD
Discovery Timeline
- 2025-01-27 - CVE-2024-27256 published to NVD
- 2025-08-18 - Last updated in NVD database
Technical Details for CVE-2024-27256
Vulnerability Analysis
CVE-2024-27256 is classified under [CWE-327] (Use of a Broken or Risky Cryptographic Algorithm). IBM MQ Container relies on cryptographic primitives that no longer meet modern strength expectations for protecting data confidentiality. An attacker who can intercept or otherwise obtain ciphertext produced or consumed by the affected MQ components can attempt offline decryption against the weakened algorithm.
The impact is confidentiality-focused. Successful exploitation does not modify messages or disrupt availability, but it can expose message payloads, credentials, and integration data flowing across queue managers. Enterprise messaging fabrics often carry financial transactions, identity data, and inter-service control traffic, so disclosure is consequential.
The vulnerability is reachable over the network without authentication or user interaction, which increases its exposure surface in clustered or multi-tenant Kubernetes and OpenShift environments where MQ Operator deployments serve multiple workloads.
Root Cause
The root cause is the selection or default configuration of cryptographic algorithms within the affected MQ container images and operator-managed queue managers. The chosen algorithms or parameters provide insufficient cryptographic strength against current computational capabilities, allowing recovery of plaintext from intercepted ciphertext under feasible conditions.
Attack Vector
The attack vector is network-based. An adversary must capture or access protected MQ traffic or stored ciphertext generated by a vulnerable container. The attacker then performs cryptanalysis against the weak algorithm offline. No prior privileges and no interaction with a legitimate MQ user are required.
No public proof-of-concept code, exploit module, or CISA KEV listing exists for CVE-2024-27256 at the time of writing. Refer to the IBM Security Patch Notice for vendor-supplied technical detail.
Detection Methods for CVE-2024-27256
Indicators of Compromise
- Negotiated TLS or MQ channel sessions using deprecated ciphers, legacy hash functions, or short key lengths against affected queue managers.
- Unexpected long-lived passive connections or traffic mirroring against MQ listener ports (default 1414) from non-administrative sources.
- Container images matching vulnerable tags in the ibm-mqadvanced-server or mq-operator registries still running in production clusters.
Detection Strategies
- Inventory all running IBM MQ Operator and MQ Advanced container image versions and compare against the affected CPE list in the IBM advisory.
- Inspect queue manager SSLCIPH channel attributes and qm.ini SSL stanzas to identify weak cipher specifications still in use.
- Audit Kubernetes and OpenShift manifests for QueueManager custom resources pinned to vulnerable operator versions.
Monitoring Recommendations
- Log and alert on MQ channel negotiations that fall back to deprecated cipher suites or non-FIPS-approved algorithms.
- Continuously scan container registries for affected image digests and block deployment of vulnerable tags via admission policies.
- Correlate network capture metadata at MQ ingress points to detect unauthorized session interception attempts.
How to Mitigate CVE-2024-27256
Immediate Actions Required
- Upgrade to the fixed IBM MQ Operator and MQ Advanced container image versions identified in the IBM Security Patch Notice.
- Rotate any cryptographic keys, certificates, and shared secrets used by affected queue managers, since past traffic may already be compromised.
- Restrict network reachability of MQ listeners to known application subnets and management hosts only.
Patch Information
IBM has released updated container images and operator versions that remove the weak cryptographic algorithms. Customers should follow the remediation guidance in the IBM Security Patch Notice and redeploy queue manager pods using the corrected images.
Workarounds
- Explicitly configure MQ channels to enforce strong cipher specifications such as modern TLS 1.2/1.3 suites and disable legacy algorithms in SSLCIPH settings.
- Enable FIPS mode on queue managers where supported to constrain algorithm selection to vetted primitives.
- Place affected MQ workloads behind a mutually authenticated TLS proxy that enforces strong cryptography until patched images are deployed.
# Configuration example: enforce a strong cipher specification on an MQ SVRCONN channel
# Run inside the queue manager container via runmqsc
runmqsc <QMGR_NAME> <<EOF
ALTER CHANNEL(APP.SVRCONN) CHLTYPE(SVRCONN) SSLCIPH(ANY_TLS12_OR_HIGHER)
ALTER QMGR SSLFIPS(YES)
REFRESH SECURITY TYPE(SSL)
EOF
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
