Vulnerabilities > CVE-2019-18281 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in multiple products
Attack vector
NETWORK Attack complexity
MEDIUM Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
PARTIAL Summary
An out-of-bounds memory access in the generateDirectionalRuns() function in qtextengine.cpp in Qt qtbase 5.11.x and 5.12.x before 5.12.5 allows attackers to cause a denial of service by crashing an application via a text file containing many directional characters.
Vulnerable Configurations
Part | Description | Count |
---|---|---|
Application | 23 | |
OS | 2 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Overflow Buffers Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
- Client-side Injection-induced Buffer Overflow This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
- Filter Failure through Buffer Overflow In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
- MIME Conversion An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.
Nessus
NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-202003-60.NASL description The remote host is affected by the vulnerability described in GLSA-202003-60 (QtCore: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in QtCore. Please review the CVE identifiers referenced below for details. Impact : An attacker could possibly execute arbitrary code with the privileges of the process or cause a Denial of Service condition. Workaround : There is no known workaround at this time. last seen 2020-04-01 modified 2020-03-27 plugin id 134968 published 2020-03-27 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/134968 title GLSA-202003-60 : QtCore: Multiple vulnerabilities code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Gentoo Linux Security Advisory GLSA 202003-60. # # The advisory text is Copyright (C) 2001-2020 Gentoo Foundation, Inc. # and licensed under the Creative Commons - Attribution / Share Alike # license. See http://creativecommons.org/licenses/by-sa/3.0/ # include("compat.inc"); if (description) { script_id(134968); script_version("1.2"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/31"); script_cve_id("CVE-2019-18281", "CVE-2020-0569", "CVE-2020-0570"); script_xref(name:"GLSA", value:"202003-60"); script_name(english:"GLSA-202003-60 : QtCore: Multiple vulnerabilities"); script_summary(english:"Checks for updated package(s) in /var/db/pkg"); script_set_attribute( attribute:"synopsis", value: "The remote Gentoo host is missing one or more security-related patches." ); script_set_attribute( attribute:"description", value: "The remote host is affected by the vulnerability described in GLSA-202003-60 (QtCore: Multiple vulnerabilities) Multiple vulnerabilities have been discovered in QtCore. Please review the CVE identifiers referenced below for details. Impact : An attacker could possibly execute arbitrary code with the privileges of the process or cause a Denial of Service condition. Workaround : There is no known workaround at this time." ); script_set_attribute( attribute:"see_also", value:"https://security.gentoo.org/glsa/202003-60" ); script_set_attribute( attribute:"solution", value: "All QtCore 5.12.x users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose '>=dev-qt/qtcore-5.12.3-r2' All QtCore 5.13.x users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose '>=dev-qt/qtcore-5.13.2-r2'" ); script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P"); 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:R/S:U/C:N/I:N/A:L"); 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:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:qtcore"); script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux"); script_set_attribute(attribute:"vuln_publication_date", value:"2019/10/23"); script_set_attribute(attribute:"patch_publication_date", value:"2020/03/26"); script_set_attribute(attribute:"plugin_publication_date", value:"2020/03/27"); script_set_attribute(attribute:"generated_plugin", value:"current"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"Gentoo Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("qpkg.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo"); if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING); flag = 0; if (qpkg_check(package:"dev-qt/qtcore", unaffected:make_list("rge 5.12.3-r2", "rge 5.13.2-r2"), vulnerable:make_list("lt 5.13.2-r2"))) flag++; if (flag) { if (report_verbosity > 0) security_warning(port:0, extra:qpkg_report_get()); else security_warning(0); exit(0); } else { tested = qpkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "QtCore"); }
NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-4275-1.NASL description It was discovered that Qt incorrectly handled certain PPM images. If a user or automated system were tricked into opening a specially crafted PPM file, a remote attacker could cause Qt to crash, resulting in a denial of service. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-19872) It was discovered that Qt incorrectly handled certain text files. If a user or automated system were tricked into opening a specially crafted text file, a remote attacker could cause Qt to crash, resulting in a denial of service. This issue only affected Ubuntu 19.10. (CVE-2019-18281) It was discovered that Qt incorrectly searched for plugins in the current working directory. An attacker could possibly use this issue to execute arbitrary code. (CVE-2020-0569) It was discovered that Qt incorrectly searched for libraries relative to the current working directory. An attacker could possibly use this issue to execute arbitrary code. This issue only affected Ubuntu 19.10. (CVE-2020-0570). Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 133647 published 2020-02-12 reporter Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133647 title Ubuntu 16.04 LTS / 18.04 LTS / 19.10 : qtbase-opensource-src vulnerabilities (USN-4275-1) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-4556.NASL description An out-of-bounds memory access was discovered in the Qt library, which could result in denial of service through a text file containing many directional characters. The oldstable distribution (stretch) is not affected. last seen 2020-06-01 modified 2020-06-02 plugin id 130437 published 2019-11-01 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/130437 title Debian DSA-4556-1 : qtbase-opensource-src - security update
References
- https://bugreports.qt.io/browse/QTBUG-77819
- https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1848784
- https://codereview.qt-project.org/c/qt/qtbase/+/271889
- https://seclists.org/bugtraq/2019/Nov/4
- https://security.gentoo.org/glsa/202003-60
- https://usn.ubuntu.com/4275-1/
- https://www.debian.org/security/2019/dsa-4556