VDB-120425 · CVE-2018-13303 · BID 104675

FFmpeg 4.0.1 libavcodec/ac3_parser.c init_get_bits8 null pointer dereference

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability marked as problematic has been reported in FFmpeg 4.0.1. This affects the function init_get_bits8 of the file libavcodec/ac3_parser.c. The manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2018-13303. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in FFmpeg 4.0.1 (Multimedia Processing Software) and classified as problematic. This issue affects the function init_get_bits8 of the file libavcodec/ac3_parser.c. 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. The summary by CVE is:

In FFmpeg 4.0.1, a missing check for failure of a call to init_get_bits8() in the avpriv_ac3_parse_header function in libavcodec/ac3_parser.c may trigger a NULL pointer dereference while converting a crafted AVI file to MPEG4, leading to a denial of service.

The bug was discovered 06/27/2018. The weakness was published 07/05/2018 by Alex (Website). The advisory is shared at securityfocus.com. The identification of this vulnerability is CVE-2018-13303 since 07/05/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, 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.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 104675†). Similar entries are available at VDB-120422, VDB-120423 and VDB-120424. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Multimedia Processing Software

Name

FFmpeg

Version

4.0.1

License

open-source

Website

Product: https://ffmpeg.org/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.4

VulDB Base Score: 4.3
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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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: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Patch: github.com

Timelineinfo

06/27/2018 🔍
07/05/2018 +7 days 🔍
07/05/2018 +0 days 🔍
07/05/2018 +0 days 🔍
07/05/2018 +0 days 🔍
07/05/2018 +0 days 🔍
04/03/2023 +1733 days 🔍

Sourcesinfo

Product: ffmpeg.org

Advisory: 00e8181bd97c834fe60751b0c511d4bb97875f78⛔
Researcher: Alex
Status: Not defined

CVE: CVE-2018-13303 (🔍)
GCVE (CVE): GCVE-0-2018-13303
GCVE (VulDB): GCVE-100-120425
SecurityFocus: 104675 - FFmpeg Multiple Denial of Service Vulnerabilities

See also: 🔍

Entryinfo

Created: 07/05/2018 23:18
Updated: 04/03/2023 14:54
Changes: 07/05/2018 23:18 (60), 02/25/2020 21:13 (4), 04/03/2023 14:54 (4)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.