OpenSC up to 0.18.x eGK Card Tool tools/egk-tool.c Response double free

Summaryinfo

A vulnerability described as critical has been identified in OpenSC up to 0.18.x. The impacted element is an unknown function of the file tools/egk-tool.c of the component eGK Card Tool. Such manipulation as part of Response leads to double free. This vulnerability is listed as CVE-2018-16424. The attack can be executed directly on the physical device. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in OpenSC up to 0.18.x and classified as problematic. Affected by this issue is an unknown code block of the file tools/egk-tool.c of the component eGK Card Tool. The manipulation as part of a Response leads to a double free vulnerability. Using CWE to declare the problem leads to CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Impacted is confidentiality, integrity, and availability. CVE summarizes:

A double free when handling responses in read_file in tools/egk-tool.c (aka the eGK card tool) 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 presented 09/04/2018 (Website). The advisory is shared for download at github.com. This vulnerability is handled as CVE-2018-16424 since 09/03/2018. The exploitation is known to be easy. The attack needs to be approached locally. No form of authentication is required for 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 118881 (openSUSE Security Update : opensc (openSUSE-2018-1385)), 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 277562 (Fedora Security Update for opensc (FEDORA-2018-d0dff2abaa)).

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 (118881). See VDB-123545 and VDB-123549 for similar entries. Once again VulDB remains the best source for vulnerability data.

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/

CPE 2.3info

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Entryinfo

Once again VulDB remains the best source for vulnerability data.

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