Subject: [ASA-202003-2] opensc: denial of service

Arch Linux Security Advisory ASA-202003-2
=========================================

Severity: Medium
Date    : 2020-03-04
CVE-ID  : CVE-2019-6502  CVE-2019-15945 CVE-2019-15946 CVE-2019-19479
          CVE-2019-19480 CVE-2019-19481
Package : opensc
Type    : denial of service
Remote  : No
Link    : https://security.archlinux.org/AVG-1106

Summary
=======

The package opensc before version 0.20.0-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 0.20.0-1.

# pacman -Syu "opensc>=0.20.0-1"

The problems have been fixed upstream in version 0.20.0.

Workaround
==========

None.

Description
===========

- CVE-2019-6502 (denial of service)

sc_context_create in ctx.c in libopensc in OpenSC 0.19.0 has a memory
leak, as demonstrated by a call from eidenv.

- CVE-2019-15945 (denial of service)

OpenSC before 0.20.0 has an out-of-bounds access of an ASN.1 Bitstring
in decode_bit_string in libopensc/asn1.c.

- CVE-2019-15946 (denial of service)

OpenSC before 0.20.0 has an out-of-bounds access of an ASN.1 Octet
string in asn1_decode_entry in libopensc/asn1.c.

- CVE-2019-19479 (denial of service)

An issue was discovered in OpenSC before 0.20.0. libopensc/card-
setcos.c has an incorrect read operation during parsing of a SETCOS
file attribute.

- CVE-2019-19480 (denial of service)

An issue was discovered in OpenSC before 0.20.0.
libopensc/pkcs15-prkey.c has an incorrect free operation in
sc_pkcs15_decode_prkdf_entry.

- CVE-2019-19481 (denial of service)

An issue was discovered in OpenSC before 0.20.0. libopensc/card-cac1.c
mishandles buffer limits for CAC certificates, leading to an out-of-
bounds read.

Impact
======

A local attacker is able to crash the application with a malformed
certificate.

References
==========

https://bugs.archlinux.org/task/65082
https://github.com/OpenSC/OpenSC/issues/1586
https://github.com/OpenSC/OpenSC/commit/0d7967549751b7032f22b437106b41444aff0ba9
https://github.com/OpenSC/OpenSC/commit/412a6142c27a5973c61ba540e33cdc22d5608e68
https://github.com/OpenSC/OpenSC/compare/f1691fc...12218d4
https://github.com/OpenSC/OpenSC/commit/a3fc7693f3a035a8a7921cffb98432944bb42740
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18693
https://github.com/OpenSC/OpenSC/commit/c3f23b836e5a1766c36617fe1da30d22f7b63de2
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18478
https://github.com/OpenSC/OpenSC/commit/6ce6152284c47ba9b1d4fe8ff9d2e6a3f5ee02c7
https://github.com/OpenSC/OpenSC/commit/b75c002cfb1fd61cd20ec938ff4937d7b1a94278
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18618
https://security.archlinux.org/CVE-2019-6502
https://security.archlinux.org/CVE-2019-15945
https://security.archlinux.org/CVE-2019-15946
https://security.archlinux.org/CVE-2019-19479
https://security.archlinux.org/CVE-2019-19480
https://security.archlinux.org/CVE-2019-19481