Exempi up to 2.4.4 WEBP_Support.cpp WEBP::VP8XChunk null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.3$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in Exempi up to 2.4.4. Impacted is the function WEBP::VP8XChunk of the file XMPFiles/source/FormatSupport/WEBP_Support.cpp. Such manipulation leads to null pointer dereference. This vulnerability is uniquely identified as CVE-2018-7731. Local access is required to approach this attack. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Exempi up to 2.4.4 and classified as problematic. Affected by this issue is the function WEBP::VP8XChunk of the file XMPFiles/source/FormatSupport/WEBP_Support.cpp. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to 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. Impacted is availability. CVE summarizes:

An issue was discovered in Exempi through 2.4.4. XMPFiles/source/FormatSupport/WEBP_Support.cpp does not check whether a bitstream has a NULL value, leading to a NULL pointer dereference in the WEBP::VP8XChunk class.

The bug was discovered 02/26/2018. The weakness was disclosed 03/06/2018 (Website). The advisory is shared for download at bugs.freedesktop.org. This vulnerability is handled as CVE-2018-7731 since 03/06/2018. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 108839 (Fedora 27 : exempi (2018-c442aad4dc)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277698 (Fedora Security Update for exempi (FEDORA-2018-c442aad4dc)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (108839). The entries VDB-114149, VDB-114150, VDB-114151 and VDB-114655 are pretty similar. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.3

VulDB Base Score: 3.3
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 108839
Nessus Name: Fedora 27 : exempi (2018-c442aad4dc)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 861012
OpenVAS Name: Fedora Update for exempi FEDORA-2018-c442aad4dc
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: cgit.freedesktop.org

Timelineinfo

02/26/2018 🔍
03/06/2018 +8 days 🔍
03/06/2018 +0 days 🔍
03/06/2018 +0 days 🔍
03/07/2018 +1 days 🔍
04/04/2018 +28 days 🔍
04/05/2018 +1 days 🔍
02/17/2023 +1779 days 🔍

Sourcesinfo

Advisory: FEDORA-2018-c442aad4dc
Status: Confirmed

CVE: CVE-2018-7731 (🔍)
GCVE (CVE): GCVE-0-2018-7731
GCVE (VulDB): GCVE-100-114152
See also: 🔍

Entryinfo

Created: 03/07/2018 08:03
Updated: 02/17/2023 09:21
Changes: 03/07/2018 08:03 (72), 01/11/2020 06:19 (3), 02/17/2023 09:20 (5), 02/17/2023 09:21 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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