CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
61.1%
Noteworthy changes in release 4.11 (released 2017-05-27) [stable]
Introduced the ASN1_TIME_ENCODING_ERROR error code to indicate an invalid encoding in the DER time fields.
Introduced flag ASN1_DECODE_FLAG_ALLOW_INCORRECT_TIME.
This flag allows decoding errors in time fields even when in strict DER mode. That is introduced in order to allow toleration of invalid times in X.509 certificates (which are common) even though strict DER adherence is enforced in other fields.
Added safety check in asn1_find_node(). That prevents a crash when a very long variable name is provided by the developer. Note that this to be exploited requires controlling the ASN.1 definitions used by the developer, i.e., the ‘name’ parameter of asn1_write_value() or asn1_read_value(). The library is not designed to protect against malicious manipulation of the developer assigned variable names. Reported by Jakub Jirasek.
Noteworthy changes in release 4.10 (released 2017-01-16) [stable]
Updated gnulib
Removed -Werror from default compiler flags
Fixed undefined behavior when negating integers in
_asn1_ltostr(). Issue found by oss-fuzz project (via gnutls):
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38 8
Pass the correct length to
_asn1_get_indefinite_length_string in asn1_get_length_ber. This addresses reading 1-byte past the end of data. Issue found by oss-fuzz project (via gnutls):
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33 0 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33 1
Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Fedora Security Advisory FEDORA-2017-d5cf1a55ce.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(101725);
script_version("3.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/06");
script_cve_id("CVE-2017-6891");
script_xref(name:"FEDORA", value:"2017-d5cf1a55ce");
script_name(english:"Fedora 26 : mingw-libtasn1 (2017-d5cf1a55ce)");
script_summary(english:"Checks rpm output for the updated package.");
script_set_attribute(
attribute:"synopsis",
value:"The remote Fedora host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"Noteworthy changes in release 4.11 (released 2017-05-27) [stable]
- Introduced the ASN1_TIME_ENCODING_ERROR error code to
indicate an invalid encoding in the DER time fields.
- Introduced flag ASN1_DECODE_FLAG_ALLOW_INCORRECT_TIME.
This flag allows decoding errors in time fields even
when in strict DER mode. That is introduced in order to
allow toleration of invalid times in X.509 certificates
(which are common) even though strict DER adherence is
enforced in other fields.
- Added safety check in asn1_find_node(). That prevents a
crash when a very long variable name is provided by the
developer. Note that this to be exploited requires
controlling the ASN.1 definitions used by the developer,
i.e., the 'name' parameter of asn1_write_value() or
asn1_read_value(). The library is not designed to
protect against malicious manipulation of the developer
assigned variable names. Reported by Jakub Jirasek.
Noteworthy changes in release 4.10 (released 2017-01-16) [stable]
- Updated gnulib
- Removed -Werror from default compiler flags
- Fixed undefined behavior when negating integers in
_asn1_ltostr(). Issue found by oss-fuzz project (via
gnutls):
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=38
8
- Pass the correct length to
_asn1_get_indefinite_length_string in
asn1_get_length_ber. This addresses reading 1-byte past
the end of data. Issue found by oss-fuzz project (via
gnutls):
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33
0
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=33
1
Note that Tenable Network Security has extracted the preceding
description block directly from the Fedora update system website.
Tenable has attempted to automatically clean and format it as much as
possible without introducing additional issues."
);
script_set_attribute(
attribute:"see_also",
value:"https://bodhi.fedoraproject.org/updates/FEDORA-2017-d5cf1a55ce"
);
script_set_attribute(
attribute:"see_also",
value:"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=331"
);
script_set_attribute(
attribute:"solution",
value:"Update the affected mingw-libtasn1 package."
);
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:mingw-libtasn1");
script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:26");
script_set_attribute(attribute:"vuln_publication_date", value:"2017/05/22");
script_set_attribute(attribute:"patch_publication_date", value:"2017/06/09");
script_set_attribute(attribute:"plugin_publication_date", value:"2017/07/17");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2017-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_family(english:"Fedora Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
os_ver = pregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
os_ver = os_ver[1];
if (! preg(pattern:"^26([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 26", "Fedora " + os_ver);
if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);
flag = 0;
if (rpm_check(release:"FC26", reference:"mingw-libtasn1-4.12-1.fc26")) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get()
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "mingw-libtasn1");
}
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:M/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS
Percentile
61.1%