4.3

CVE-2020-13131

Exploit

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.

Data is provided by the National Vulnerability Database (NVD)
Yubico ≫ Libykpiv Version < 2.1.0
Yubico ≫ Piv Tool Manager Version < 2.0.0
Yubico ≫ Yubikey Smart Card Minidriver Version <= 4.1.0.172
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.07% 0.184
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 4.3 0.7 3.6
CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
nvd@nist.gov 1.9 3.4 2.9
AV:L/AC:M/Au:N/C:P/I:N/A:N
cve@mitre.org 4.3 0.7 3.6
CVSS:3.0/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
CWE-125 Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.