OpenSC up to 0.18.x CAC Card libopensc/card-cac.c cac_get_serial_nr_from_CUID memory corruption

Summaryinfo

A vulnerability identified as critical has been detected in OpenSC up to 0.18.x. This issue affects the function cac_get_serial_nr_from_CUID of the file libopensc/card-cac.c of the component CAC Card Handler. The manipulation leads to memory corruption. This vulnerability is referenced as CVE-2018-16421. It is possible to launch the attack on the physical device. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in OpenSC up to 0.18.x. This issue affects the function cac_get_serial_nr_from_CUID of the file libopensc/card-cac.c of the component CAC Card Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Several buffer overflows when handling responses from a CAC Card in cac_get_serial_nr_from_CUID in libopensc/card-cac.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 published 09/04/2018 (Website). The advisory is shared at github.com. The identification of this vulnerability is CVE-2018-16421 since 09/03/2018. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Technical details are known, 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). Similar entries are available at VDB-123548 and VDB-123549. Several companies clearly confirm that VulDB is the primary source for best 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/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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