OpenSC up to 0.18.x Gemsafe V1 Smartcard pkcs15-gemsafeV1.c gemsafe_get_cert_len memory corruption

Summaryinfo

A vulnerability was found in OpenSC up to 0.18.x. It has been declared as critical. This impacts the function gemsafe_get_cert_len of the file libopensc/pkcs15-gemsafeV1.c of the component Gemsafe V1 Smartcard Handler. The manipulation as part of Smartcard results in memory corruption. This vulnerability was named CVE-2018-16393. An attack on the physical device is feasible. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in OpenSC up to 0.18.x. Affected is the function gemsafe_get_cert_len of the file libopensc/pkcs15-gemsafeV1.c of the component Gemsafe V1 Smartcard Handler. The manipulation as part of a Smartcard leads to a memory corruption vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Several buffer overflows when handling responses from a Gemsafe V1 Smartcard in gemsafe_get_cert_len in libopensc/pkcs15-gemsafeV1.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 05/26/2018. The weakness was presented 09/03/2018 (Website). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2018-16393 since 09/03/2018. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 100 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). See VDB-123526, VDB-123527, VDB-123542 and VDB-123543 for similar entries. 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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Entryinfo

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

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