Vulnerabilities > CVE-2019-14855 - Inadequate Encryption Strength vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
NONE Availability impact
NONE Summary
A flaw was found in the way certificate signatures could be forged using collisions found in the SHA-1 algorithm. An attacker could use this weakness to create forged certificate signatures. This issue affects GnuPG versions before 2.2.18.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Brute Force In this attack, some asset (information, functionality, identity, etc.) is protected by a finite secret value. The attacker attempts to gain access to this asset by using trial-and-error to exhaustively explore all the possible secret values in the hope of finding the secret (or a value that is functionally equivalent) that will unlock the asset. Examples of secrets can include, but are not limited to, passwords, encryption keys, database lookup keys, and initial values to one-way functions. The key factor in this attack is the attackers' ability to explore the possible secret space rapidly. This, in turn, is a function of the size of the secret space and the computational power the attacker is able to bring to bear on the problem. If the attacker has modest resources and the secret space is large, the challenge facing the attacker is intractable. While the defender cannot control the resources available to an attacker, they can control the size of the secret space. Creating a large secret space involves selecting one's secret from as large a field of equally likely alternative secrets as possible and ensuring that an attacker is unable to reduce the size of this field using available clues or cryptanalysis. Doing this is more difficult than it sounds since elimination of patterns (which, in turn, would provide an attacker clues that would help them reduce the space of potential secrets) is difficult to do using deterministic machines, such as computers. Assuming a finite secret space, a brute force attack will eventually succeed. The defender must rely on making sure that the time and resources necessary to do so will exceed the value of the information. For example, a secret space that will likely take hundreds of years to explore is likely safe from raw-brute force attacks.
- Encryption Brute Forcing An attacker, armed with the cipher text and the encryption algorithm used, performs an exhaustive (brute force) search on the key space to determine the key that decrypts the cipher text to obtain the plaintext.
Nessus
NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2020-2_0-0229_GNUPG.NASL description An update of the gnupg package has been released. last seen 2020-04-30 modified 2020-04-22 plugin id 135868 published 2020-04-22 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135868 title Photon OS 2.0: Gnupg PHSA-2020-2.0-0229 code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from VMware Security Advisory PHSA-2020-2.0-0229. The text # itself is copyright (C) VMware, Inc. include('compat.inc'); if (description) { script_id(135868); script_version("1.2"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/23"); script_cve_id("CVE-2019-14855"); script_name(english:"Photon OS 2.0: Gnupg PHSA-2020-2.0-0229"); script_set_attribute(attribute:"synopsis", value: "The remote PhotonOS host is missing multiple security updates."); script_set_attribute(attribute:"description", value: "An update of the gnupg package has been released."); script_set_attribute(attribute:"see_also", value:"https://github.com/vmware/photon/wiki/Security-Updates-2-229.md"); script_set_attribute(attribute:"solution", value: "Update the affected Linux packages."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-14855"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2020/03/20"); script_set_attribute(attribute:"patch_publication_date", value:"2020/04/14"); script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/22"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:gnupg"); script_set_attribute(attribute:"cpe", value:"cpe:/o:vmware:photonos:2.0"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"PhotonOS Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/PhotonOS/release", "Host/PhotonOS/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/PhotonOS/release"); if (isnull(release) || release !~ "^VMware Photon") audit(AUDIT_OS_NOT, "PhotonOS"); if (release !~ "^VMware Photon (?:Linux|OS) 2\.0(\D|$)") audit(AUDIT_OS_NOT, "PhotonOS 2.0"); if (!get_kb_item("Host/PhotonOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); cpu = get_kb_item("Host/cpu"); if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH); if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "PhotonOS", cpu); flag = 0; if (rpm_check(release:"PhotonOS-2.0", cpu:"x86_64", reference:"gnupg-2.2.18-1.ph2")) flag++; if (rpm_check(release:"PhotonOS-2.0", cpu:"x86_64", reference:"gnupg-debuginfo-2.2.18-1.ph2")) 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, "gnupg"); }NASL family Huawei Local Security Checks NASL id EULEROS_SA-2020-1504.NASL description According to the version of the gnupg2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerability : - A flaw was found in the way certificate signatures could be forged using collisions found in the SHA-1 algorithm. An attacker could use this weakness to create forged certificate signatures. This issue affects GnuPG versions before 2.2.18.(CVE-2019-14855) Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-05-03 modified 2020-04-20 plugin id 135737 published 2020-04-20 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135737 title EulerOS 2.0 SP8 : gnupg2 (EulerOS-SA-2020-1504) code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(135737); script_version("1.3"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/01"); script_cve_id( "CVE-2019-14855" ); script_name(english:"EulerOS 2.0 SP8 : gnupg2 (EulerOS-SA-2020-1504)"); script_summary(english:"Checks the rpm output for the updated package."); script_set_attribute(attribute:"synopsis", value: "The remote EulerOS host is missing a security update."); script_set_attribute(attribute:"description", value: "According to the version of the gnupg2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerability : - A flaw was found in the way certificate signatures could be forged using collisions found in the SHA-1 algorithm. An attacker could use this weakness to create forged certificate signatures. This issue affects GnuPG versions before 2.2.18.(CVE-2019-14855) Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues."); # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2020-1504 script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2d7ee2cb"); script_set_attribute(attribute:"solution", value: "Update the affected gnupg2 package."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"patch_publication_date", value:"2020/04/20"); script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/20"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:gnupg2"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:gnupg2-smime"); script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0"); script_set_attribute(attribute:"generated_plugin", value:"current"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Huawei Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp"); script_exclude_keys("Host/EulerOS/uvp_version"); 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/EulerOS/release"); if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS"); if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0"); sp = get_kb_item("Host/EulerOS/sp"); if (isnull(sp) || sp !~ "^(8)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8"); uvp = get_kb_item("Host/EulerOS/uvp_version"); if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP8", "EulerOS UVP " + uvp); if (!get_kb_item("Host/EulerOS/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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu); if ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu); flag = 0; pkgs = ["gnupg2-2.2.9-1.h5.eulerosv2r8", "gnupg2-smime-2.2.9-1.h5.eulerosv2r8"]; foreach (pkg in pkgs) if (rpm_check(release:"EulerOS-2.0", sp:"8", reference:pkg)) 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, "gnupg2"); }NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2020-1_0-0288_GNUPG.NASL description An update of the gnupg package has been released. last seen 2020-04-22 modified 2020-04-15 plugin id 135488 published 2020-04-15 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135488 title Photon OS 1.0: Gnupg PHSA-2020-1.0-0288 code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from VMware Security Advisory PHSA-2020-1.0-0288. The text # itself is copyright (C) VMware, Inc. include('compat.inc'); if (description) { script_id(135488); script_version("1.2"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/21"); script_cve_id("CVE-2019-14855"); script_name(english:"Photon OS 1.0: Gnupg PHSA-2020-1.0-0288"); script_set_attribute(attribute:"synopsis", value: "The remote PhotonOS host is missing multiple security updates."); script_set_attribute(attribute:"description", value: "An update of the gnupg package has been released."); script_set_attribute(attribute:"see_also", value:"https://github.com/vmware/photon/wiki/Security-Updates-1.0-288.md"); script_set_attribute(attribute:"solution", value: "Update the affected Linux packages."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-14855"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2020/03/20"); script_set_attribute(attribute:"patch_publication_date", value:"2020/04/11"); script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/15"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:gnupg"); script_set_attribute(attribute:"cpe", value:"cpe:/o:vmware:photonos:1.0"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"PhotonOS Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/PhotonOS/release", "Host/PhotonOS/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/PhotonOS/release"); if (isnull(release) || release !~ "^VMware Photon") audit(AUDIT_OS_NOT, "PhotonOS"); if (release !~ "^VMware Photon (?:Linux|OS) 1\.0(\D|$)") audit(AUDIT_OS_NOT, "PhotonOS 1.0"); if (!get_kb_item("Host/PhotonOS/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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "PhotonOS", cpu); flag = 0; if (rpm_exists(rpm:"gnupg-2.2", release:"PhotonOS-1.0") && rpm_check(release:"PhotonOS-1.0", cpu:"x86_64", reference:"gnupg-2.2.18-1.ph1")) flag++; if (rpm_check(release:"PhotonOS-1.0", cpu:"x86_64", reference:"gnupg-debuginfo-2.2.18-1.ph1")) 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, "gnupg"); }NASL family PhotonOS Local Security Checks NASL id PHOTONOS_PHSA-2020-3_0-0080_GNUPG.NASL description An update of the gnupg package has been released. last seen 2020-04-30 modified 2020-04-21 plugin id 135791 published 2020-04-21 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135791 title Photon OS 3.0: Gnupg PHSA-2020-3.0-0080 code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from VMware Security Advisory PHSA-2020-3.0-0080. The text # itself is copyright (C) VMware, Inc. include('compat.inc'); if (description) { script_id(135791); script_version("1.2"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/23"); script_cve_id("CVE-2019-14855"); script_name(english:"Photon OS 3.0: Gnupg PHSA-2020-3.0-0080"); script_set_attribute(attribute:"synopsis", value: "The remote PhotonOS host is missing multiple security updates."); script_set_attribute(attribute:"description", value: "An update of the gnupg package has been released."); script_set_attribute(attribute:"see_also", value:"https://github.com/vmware/photon/wiki/Security-Updates-3.0-80.md"); script_set_attribute(attribute:"solution", value: "Update the affected Linux packages."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"); script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-14855"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"vuln_publication_date", value:"2020/03/20"); script_set_attribute(attribute:"patch_publication_date", value:"2020/04/14"); script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/21"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:vmware:photonos:gnupg"); script_set_attribute(attribute:"cpe", value:"cpe:/o:vmware:photonos:3.0"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"PhotonOS Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/PhotonOS/release", "Host/PhotonOS/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/PhotonOS/release"); if (isnull(release) || release !~ "^VMware Photon") audit(AUDIT_OS_NOT, "PhotonOS"); if (release !~ "^VMware Photon (?:Linux|OS) 3\.0(\D|$)") audit(AUDIT_OS_NOT, "PhotonOS 3.0"); if (!get_kb_item("Host/PhotonOS/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$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "PhotonOS", cpu); flag = 0; if (rpm_check(release:"PhotonOS-3.0", cpu:"x86_64", reference:"gnupg-2.2.18-1.ph3")) flag++; if (rpm_check(release:"PhotonOS-3.0", cpu:"x86_64", reference:"gnupg-debuginfo-2.2.18-1.ph3")) 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, "gnupg"); }
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14855
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14855
- https://dev.gnupg.org/T4755
- https://dev.gnupg.org/T4755
- https://lists.gnupg.org/pipermail/gnupg-announce/2019q4/000442.html
- https://lists.gnupg.org/pipermail/gnupg-announce/2019q4/000442.html
- https://rwc.iacr.org/2020/slides/Leurent.pdf
- https://rwc.iacr.org/2020/slides/Leurent.pdf
- https://usn.ubuntu.com/4516-1/
- https://usn.ubuntu.com/4516-1/