Qt up to 5.11.2 QGifHandler GIF Image null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

A vulnerability was found in Qt up to 5.11.2. It has been declared as critical. This vulnerability affects the function QGifHandler. The manipulation as part of a GIF Image leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

An issue was discovered in Qt before 5.11.3. A malformed GIF image causes a NULL pointer dereference in QGifHandler resulting in a segmentation fault.

The bug was discovered 12/04/2018. The weakness was released 12/26/2018 (Website). The advisory is available at blog.qt.io. This vulnerability was named CVE-2018-19870 since 12/05/2018. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

The vulnerability was handled as a non-public zero-day exploit for at least 22 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 120960 (Debian DLA-1627-1 : qtbase-opensource-src security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 176569 (Debian Security Update for qtbase-opensource-src (DSA 4374-1)).

Upgrading to version 5.11.3 eliminates this vulnerability. A possible mitigation has been published 2 weeks after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (120960). Entries connected to this vulnerability are available at 128436, 128445, 128447 and 128448.

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CPE 2.3info

CPE 2.2info

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CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.4

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
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NVD Base Score: 8.8
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CVSSv2info

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Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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Nessus ID: 120960
Nessus Name: Debian DLA-1627-1 : qtbase-opensource-src security update
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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Upgrade: Qt 5.11.3

Timelineinfo

12/04/2018 🔍
12/05/2018 +1 days 🔍
12/26/2018 +21 days 🔍
12/26/2018 +0 days 🔍
12/27/2018 +1 days 🔍
01/03/2019 +7 days 🔍
01/07/2019 +4 days 🔍
06/22/2023 +1627 days 🔍

Sourcesinfo

Advisory: RHSA-2019:2135
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-19870 (🔍)
See also: 🔍

Entryinfo

Created: 12/27/2018 11:08
Updated: 06/22/2023 09:17
Changes: 12/27/2018 11:08 (74), 04/24/2020 15:01 (3), 06/22/2023 09:17 (4)
Complete: 🔍

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