OpenSC up to 0.18.x ePass 2003 Card card-epass2003.c decrypt_response memory corruption

Summaryinfo

A vulnerability categorized as critical has been discovered in OpenSC up to 0.18.x. This vulnerability affects the function decrypt_response of the file libopensc/card-epass2003.c of the component ePass 2003 Card Handler. Executing a manipulation can lead to memory corruption. The identification of this vulnerability is CVE-2018-16420. The physical device can be targeted for the attack. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in OpenSC up to 0.18.x. This vulnerability affects the function decrypt_response of the file libopensc/card-epass2003.c of the component ePass 2003 Card Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Several buffer overflows when handling responses from an ePass 2003 Card in decrypt_response in libopensc/card-epass2003.c in OpenSC before 0.19.0-rc1 could be used by attackers able to supply crafted smartcards to cause a denial of service (application crash) or possibly have unspecified other impact.

The bug was discovered 08/14/2018. The weakness was shared 09/04/2018 (Website). The advisory is shared for download at github.com. This vulnerability was named CVE-2018-16420 since 09/03/2018. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 20 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 118880 (openSUSE Security Update : opensc (openSUSE-2018-1384)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 171704 (SUSE Enterprise Linux Security Update for opensc (SUSE-SU-2018:3622-1)).

Upgrading to version 0.19.0-rc1 eliminates this vulnerability. A possible mitigation has been published 3 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (118880). The entries VDB-123526, VDB-123527, VDB-123528 and VDB-123542 are related to this item. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• OpenSC

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18

License

• open-source

Website

• Product: https://github.com/OpenSC/OpenSC/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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