EUVD-2025-209253
GHSA-32vv-mwc8-ch6p
Vulnerability Assessment
| Weakness |
CWE
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| Impact | The CVSS v3.1 score of 6.2 reflects moderate-to-high severity with several limiting factors that align with real-world risk. The attack vector is Local (AV:L), requiring the attacker to have system access, which significantly restricts the threat pool compared to network-exploitable vulnerabilities. Attack complexity is Low (AC:L), meaning exploitation is straightforward once system access is obtained. No privileges are required (PR:N), and no user interaction is needed (UI:N), making exploitation reliable for any local user. The integrity impact is High (I:H), as arbitrary file overwrite can compromise application configuration, credentials, or system files. However, confidentiality and availability are not impacted (C:N/A:N). The CVSS vector does not indicate this is trivially exploitable by unprivileged users in all contexts-local file system access is mandatory. With no confirmed active exploitation (KEV status absent) and no public proof-of-concept identified, this should be prioritized by organizations where untrusted local users have system access, such as shared hosting environments or multi-tenant systems. For single-user or tightly controlled deployments, the practical risk is lower. The availability of a vendor patch reduces urgency but does not eliminate the vulnerability in unpatched instances. |
| Exploit ScenarioDerived | A local user on a shared system where IBM Concert is installed creates a symbolic link pointing to a sensitive application configuration file (e.g., /opt/concert/config/auth.properties) using a predicted temporary file name such as /tmp/concert_temp_12345. When IBM Concert executes a routine operation that writes to its temporary file, the symlink causes the write to overwrite the actual configuration file. The attacker modifies stored credentials, disables security features, or injects malicious configuration, gaining unauthorized access to the Concert application or downstream systems it integrates with. Exploitation requires only local system access and does not require elevated privileges or user interaction. |
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Alert meAnalysisAIv1 – Apr 07, 2026
IBM Concert versions 1.0.0 through 2.2.0 create temporary files with predictable names, allowing local unauthenticated attackers to overwrite arbitrary files through symlink attacks. An attacker with local system access can exploit this insecure temporary file handling to modify critical application or system files, achieving high integrity impact. No public exploit code or active exploitation has been confirmed at time of analysis.
RemediationAI
Upgrade IBM Concert to the patched version released by IBM. Organizations should consult the vendor advisory at https://www.ibm.com/support/pages/node/7268620 for the specific fixed release version applicable to their deployment. As an interim mitigation, restrict local system access to IBM Concert installation and temporary file directories to trusted users only, and monitor file system activity for suspicious symlink creation in temporary directories. Ensure the host operating system enforces secure temporary file creation protections if available (e.g., restrictive umask, secure tmpdir implementations).
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
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Technical ContextAI · show details
This vulnerability stems from inadequate temporary file creation practices, classified under CWE-340 (Generation of Predictable Numbers or Identifiers). When IBM Concert generates temporary files during operation, it uses predictable naming schemes without proper protections against symlink attacks. A local attacker can predict the temporary file path, create a symbolic link to a target file in advance, and when the application writes to the predictable temporary file location, the symlink causes the actual write operation to target an arbitrary file the attacker specifies. This is a classic TOCTOU (time-of-check-time-of-use) variant affecting local file operations. The affected product is IBM Concert, a collaboration and integration platform, across all versions from 1.0.0 through 2.2.0 (CPE: cpe:2.3:a:ibm:concert:*:*:*:*:*:*:*:*).
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Severity by source
AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Primary rating from Vendor (ibm) · only source for this CVE.
CVSS VectorVendor: ibm
Lifecycle Timeline
2DescriptionCVE.org
IBM Concert 1.0.0 through 2.2.0 creates temporary files with predictable names, which allows local users to overwrite arbitrary files via a symlink attack.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
Unauthenticated remote code execution in IBM Concert 1.0.0 through 3.0.0 lets any attacker who can reach the service sen
Use-after-free in IBM Concert 1.0.0 through 3.0.0 lets an attacker who can influence program input or execution flow cor
IBM Concert Software 1.0.0, 1.0.1, 1.0.2, and 1.0.2.1 is vulnerable to SQL injection. Rated critical severity (CVSS 9.8)
IBM Concert 1.0.0 and 1.0.1 vulnerable to attacks that rely on the use of cookies without the SameSite attribute. Rated
Improperly scoped role-based access control in IBM Concert 1.0.0 through 3.0.0 lets any authenticated user holding even
SQL injection in IBM Concert versions 1.0.0 through 2.3.1 allows remote attackers to inject specially crafted SQL statem
Concert versions up to 2.1.0 is affected by unrestricted upload of file with dangerous type (CVSS 8.8).
IBM Concert Software 1.0.0, 1.0.1, 1.0.2, and 1.0.2.1 could allow an authenticated user to perform unauthorized actions
Improper bounds checking in IBM Concert 1.0.0 through 3.0.0 lets a local, authenticated user supply overlong input that
Local code execution in IBM Concert 1.0.0 through 2.1.0 allows an authenticated attacker to overflow a stack buffer and
Local privilege escalation in IBM Concert 1.0.0 through 3.0.0 lets an attacker who already holds a low-privileged accoun
Heap memory corruption in IBM Concert 1.0.0 through 3.0.0 lets an attacker who already has low-privileged local access t
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