CVE-2018-20763 : Security Advisory and Response

GPAC versions 0.7.1 and earlier are vulnerable due to a lack of bounds checking in the gf_text_get_utf8_line function within libgpac_static.a, allowing an out-of-bounds write.

Understanding CVE-2018-20763

This CVE involves a vulnerability in GPAC versions 0.7.1 and earlier that can lead to an out-of-bounds write due to missing bounds checking.

What is CVE-2018-20763?

The absence of bounds checking in the szLineConv parameter in gf_text_get_utf8_line function found in media_tools/text_import.c within libgpac_static.a allows for an out-of-bounds write, leading to a vulnerability present in GPAC versions 0.7.1 and earlier.

The Impact of CVE-2018-20763

This vulnerability can be exploited to execute arbitrary code or cause a denial of service (DoS) attack on systems running affected GPAC versions.

Technical Details of CVE-2018-20763

GPAC versions 0.7.1 and earlier are susceptible to an out-of-bounds write due to missing bounds checking.

Vulnerability Description

The vulnerability arises from the absence of bounds checking in the szLineConv parameter in the gf_text_get_utf8_line function within libgpac_static.a.

Affected Systems and Versions

GPAC versions 0.7.1 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability to perform an out-of-bounds write, potentially leading to arbitrary code execution or DoS attacks.

Mitigation and Prevention

To address CVE-2018-20763, follow these mitigation steps:

Immediate Steps to Take

Update GPAC to a non-vulnerable version.
Implement proper input validation to prevent out-of-bounds writes.

Long-Term Security Practices

Regularly update software to the latest versions.
Conduct security assessments and code reviews to identify and address vulnerabilities.

Patching and Updates

Apply patches provided by GPAC to fix the vulnerability and enhance system security.