OpenSC up to 0.18.x libopensc/sc.c sc_file_set_sec_attr Smartcard double free

Summaryinfo

A vulnerability marked as problematic has been reported in OpenSC up to 0.18.x. The affected element is the function sc_file_set_sec_attr of the file libopensc/sc.c. This manipulation as part of Smartcard causes double free. This vulnerability is tracked as CVE-2018-16423. It is feasible to perform the attack on the physical device. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in OpenSC up to 0.18.x and classified as problematic. Affected by this vulnerability is the function sc_file_set_sec_attr of the file libopensc/sc.c. The manipulation as part of a Smartcard leads to a double free vulnerability. The CWE definition for the vulnerability is CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. As an impact it is known to affect availability. The summary by CVE is:

A double free when handling responses from a smartcard in sc_file_set_sec_attr in libopensc/sc.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 disclosed 09/04/2018 (Website). It is possible to read the advisory at github.com. This vulnerability is known as CVE-2018-16423 since 09/03/2018. The exploitation appears to be easy. Attacking locally is a requirement. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

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 pretty similar. Statistical analysis made it clear that VulDB provides the best quality 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

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion