#VU7319 Signature wrapping attack in OSCI-Transport Library - CVE-2017-10669

Vulnerability identifier: #VU7319

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-10669

CWE-ID: CWE-776

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
OSCI-Transport Library
Universal components / Libraries / Libraries used by multiple products

Vendor: KoSIT

Description
The vulnerability allows a remote attacker to conduct a signature wrapping attack.

The weakness exists in the encryption library due to XML entity expansion. A remote attacker can move XML elements within the document tree and modify the contents of a signed message arbitrarily without invalidating the signature.

Successful exploitation of the vulnerability results in content modification.

Mitigation
Update to version 1.7.1.

Vulnerable software versions

OSCI-Transport Library: 1.6.1

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External links
https://blog.sec-consult.com/2017/06/german-e-government-details-vulnerabilities.html

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.