Multiple vulnerabilities have been found in PCSC-Lite, the worst of which could lead to privilege escalation.
|Package||sys-apps/pcsc-lite on all architectures|
|Affected versions||< 1.8.20|
|Unaffected versions||>= 1.8.20|
PCSC-Lite is a middleware to access a smart card using the SCard API (PC/SC).
The SCardReleaseContext function normally releases resources associated with the given handle (including “cardsList”) and clients should cease using this handle. However, a malicious client can make the daemon invoke SCardReleaseContext and continue issuing other commands that use “cardsList”, resulting in a use-after-free. When SCardReleaseContext is invoked multiple times it additionally results in a double-free of “cardsList”.
A local attacker could use a malicious client to connect to pcscd’s Unix socket, possibly resulting in a Denial of Service condition or privilege escalation since the daemon is running as root.
There is no known workaround at this time.
All PCSC-Lite users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-apps/pcsc-lite-1.8.20"
February 01, 2017
February 01, 2017: 1