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Microsec e-Szigno / Netlock Mokka XML Signature Wrapping

Microsec e-Szigno / Netlock Mokka XML Signature Wrapping
Posted Jun 29, 2015
Authored by Imre Rad

Microsec e-Szigno and Netlock Mokka computer applications suffer from a e-akta signature verification weakness. Microsec e-Szigno version older than 3.2.7.12 and Netlock Mokka versions older than 2.7.8.1204 are affected.

tags | advisory
advisories | CVE-2015-3931, CVE-2015-3932
SHA-256 | 7c9175ecb67d017613e97ac84c7dc3741a8dc378d1f6b845cd5bdd140f7d842b

Microsec e-Szigno / Netlock Mokka XML Signature Wrapping

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In November 2014, SEARCH-LAB Ltd. discovered a security vulnerability in Microsec e-Szigno, and Netlock Mokka computer applications that are used to generate and validate
digital signatures, which are applied within the official Hungarian government processes. The vulnerability affected the „e-akta” signed document file format, where a file with a valid digital signature could be manipulated in a way that the verification software indicated a valid signature while it displayed a different document than the original.

The vulnerability details were disclosed to the affected vendors and the fixed version of the softwares were released in December, 2014.

Affected versions:
Microsec e-Szigno (older than v3.2.7.12): CVE-2015-3931
Netlock Mokka (older than v2.7.8.1204): CVE-2015-3932

The vulnerability is classified as XML Signature Wrapping. It could be triggered by inserting a new "ds:Object" node with arbitrary document payload before the original ds:Object.

The two software implementations were independent, they did not share a common codebase. The reason why both were vulnerable, is not connected to the format specification either, but two different developers independently made mistakes in implementing signatures.

References:
https://www.search-lab.hu/about-us/news/107-37-million-digitally-signed-documents-had-to-be-reverified
https://www.search-lab.hu/eakta
http://www.neih.gov.hu/?q=node/66

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