EUVD-2026-65089
GHSA-5453-gcx7-h56m
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Any unprivileged local OS user can read the 0644 file (PR:N, AV:L, AC:L); high confidentiality impact from full key disclosure enables session forgery, low integrity impact from resulting auth state manipulation.
Primary rating from Vendor (CIRCL).
CVSS VectorVendor: CIRCL
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
RansomLook created its Flask session-signing key without explicitly restricting the file permissions. The secret_key file was created using the process's default permissions and umask, resulting in permissions such as 0644 under a common 022 umask. Consequently, other local users able to access the RansomLook home directory could read the application's cryptographic secret.
The exposed key is security-critical because it is used to sign Flask session cookies and is also involved in the legacy API-key key derivation. An attacker who obtains the key can generate valid session cookies and impersonate an authenticated user, including an administrator. In LDAP configurations, exploitation may be particularly straightforward because the session user loader does not require the supplied username to correspond to an existing local user.
Successful exploitation requires local access sufficient to read the improperly protected file, but can result in complete compromise of RansomLook's authentication and authorization controls.
The patch creates new secret-key files atomically with permissions 0600 and also restricts permissions on existing key files during application startup.
Articles & Coverage 1
AnalysisAI
Insecure file creation in RansomLook (≤ 2.0.0) exposes the Flask session-signing secret to any local OS user with read access to the application home directory, enabling complete authentication bypass. The secret key governs Flask session cookie signing and the legacy API-key derivation function; possession of it allows an attacker to forge valid session cookies and impersonate any user, including administrators. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must hold a local OS user account on the host running RansomLook and must be able to read files within the RansomLook home directory. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 7.0 (AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N) reflects a local-only attack that nonetheless yields high confidentiality impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A non-privileged local user on the RansomLook host lists the application home directory and reads the world-readable secret_key file (permissions 0644). Using the 64-byte secret, the attacker constructs and signs a Flask session cookie containing the username 'admin' (or any arbitrary string in LDAP mode) and submits it to the RansomLook web interface, which cryptographically validates the signature and grants full administrator access without any password check. |
| Remediation | Apply the upstream patch from https://github.com/RansomLook/RansomLook/commit/df9d47edcf02dd0125db869d5bc19d93f426d892, which atomically creates new secret_key files at 0600 and retroactively tightens permissions on existing files at startup. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all RansomLook installations and identify systems running version 2.0.0 or earlier; restrict local filesystem access to the application home directory on affected systems as an interim measure to limit exposure. …
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External POC / Exploit Code
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