Vulnerability Name:

CVE-2019-18281 (CCN-169995)

Assigned:2019-08-31
Published:2019-08-31
Updated:2020-02-18
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.
CVSS v3 Severity:4.3 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)
3.8 Low (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
4.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)
3.8 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
4.3 Medium (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L)
3.8 Low (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
CVSS v2 Severity:4.3 Medium (CVSS v2 Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
4.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-119
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2019-18281

Source: MISC
Type: Permissions Required
https://bugreports.qt.io/browse/QTBUG-77819

Source: MISC
Type: Issue Tracking, Third Party Advisory
https://bugs.launchpad.net/ubuntu/+source/qtbase-opensource-src/+bug/1848784

Source: CCN
Type: Qt Code Review 271889
Fix crash when text contains too many directional chars

Source: MISC
Type: Patch, Vendor Advisory
https://codereview.qt-project.org/c/qt/qtbase/+/271889

Source: XF
Type: UNKNOWN
qt-qtbase-cve201918281-dos(169995)

Source: BUGTRAQ
Type: Mailing List, Third Party Advisory
20191104 [SECURITY] [DSA 4556-1] qtbase-opensource-src security update

Source: GENTOO
Type: UNKNOWN
GLSA-202003-60

Source: UBUNTU
Type: UNKNOWN
USN-4275-1

Source: DEBIAN
Type: Third Party Advisory
DSA-4556

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2019-18281

Vulnerable Configuration:Configuration 1:
  • cpe:/a:qt:qtbase:*:*:*:*:*:*:*:* (Version >= 5.11.0 and <= 5.11.3)
  • OR cpe:/a:qt:qtbase:*:*:*:*:*:*:*:* (Version >= 5.12.0 and < 5.12.5)

    • Configuration 2:
  • cpe:/o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • OR cpe:/o:debian:debian_linux:10.0:*:*:*:*:*:*:*

    • Configuration RedHat 1:
  • cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/a:redhat:enterprise_linux:8::appstream:*:*:*:*:*

    • Configuration RedHat 3:
  • cpe:/a:redhat:enterprise_linux:8::crb:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/a:qt:qtbase:5.12.4:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.redhat.rhsa:def:20201665
    P
    		RHSA-2020:1665: qt5 security, bug fix, and enhancement update (Moderate)
    2020-04-29
    oval:com.ubuntu.disco:def:2019182810000000
    V
    		CVE-2019-18281 on Ubuntu 19.04 (disco) - medium.
    2019-10-23
    oval:com.ubuntu.bionic:def:2019182810000000
    V
    		CVE-2019-18281 on Ubuntu 18.04 LTS (bionic) - medium.
    2019-10-23
    oval:com.ubuntu.xenial:def:2019182810000000
    V
    		CVE-2019-18281 on Ubuntu 16.04 LTS (xenial) - medium.
    2019-10-23
    BACK
    qt qtbase *
    qt qtbase *
    debian debian linux 9.0
    debian debian linux 10.0
    qt qtbase 5.12.4