oviva-ag/epa4all-client · Security
Improper Verification of Cryptographic Signature in com.oviva.telematik:epa4all-client
- GHSA ID
- GHSA-gqx7-6552-67hf
- CVE ID
- CVE-2026-45575
- Severity
- high
- Published
- Updated
- CVSS
- 7.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- CVSS v3
- 7.4 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Description
Impact
An attacker who can MITM the TLS connection between the client and the IDP (within the TI network) can substitute a forged discovery document. The forged document redirects u ri_puk_idp_enc and uri_puk_idp_sig to attacker-controlled URLs. The client then encrypts the SMC-B-signed challenge response to the attacker's encryption key and POSTs it to the attacker's auth endpoint. This captures the signed authentication material.
Patches
Workarounds
None.
Resources
- MS-OVIVA-EPA4ALL-d453c1
Credits
Machine Spirits ([email protected])
- Dr. rer. nat. Simon Weber
- Dipl.-Inf. Volker Schönefeld
- Chiara Fliegner
CWEs
- CWE-347 · Improper Verification of Cryptographic Signature
References
- https://github.com/oviva-ag/epa4all-client/security/advisories/GHSA-gqx7-6552-67hf ↗
- https://github.com/oviva-ag/epa4all-client/pull/36 ↗
- https://github.com/oviva-ag/epa4all-client/commit/9111d6fbb939007036a7f74b2a93bb278cb5af32 ↗
- https://github.com/oviva-ag/epa4all-client/releases/tag/v1.2.2 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-45575 ↗
- https://github.com/advisories/GHSA-gqx7-6552-67hf ↗