Yubico libykpiv up to 2.0.x RSA Key Generation lib/util.c Length Field information disclosure

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Yubico libykpiv up to 2.0.x. This vulnerability affects unknown code in the library lib/util.c of the component RSA Key Generation. Performing a manipulation as part of Length Field results in information disclosure. This vulnerability is cataloged as CVE-2020-13131. The attack may be carried out on the physical device. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Yubico libykpiv up to 2.0.x. This affects an unknown functionality in the library lib/util.c of the component RSA Key Generation. The manipulation as part of a Length Field leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

An issue was discovered in Yubico libykpiv before 2.1.0. lib/util.c in this library (which is included in yubico-piv-tool) does not properly check embedded length fields during device communication. A malicious PIV token can misreport the returned length fields during RSA key generation. This will cause stack memory to be copied into heap allocated memory that gets returned to the caller. The leaked memory could include PINs, passwords, key material, and other sensitive information depending on the integration. During further processing by the caller, this information could leak across trust boundaries. Note that RSA key generation is triggered by the host and cannot directly be triggered by the token.

The weakness was shared 07/09/2020 (Website). The advisory is shared at yubico.com. This vulnerability is uniquely identified as CVE-2020-13131 since 05/18/2020. An attack has to be approached locally. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

Upgrading to version 2.1.0 eliminates this vulnerability.

The entry VDB-157810 is related to this item. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Yubico

Name

• libykpiv

Version

• 2.0

CPE 2.3info

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CPE 2.2info

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

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