CVE-2023-27585 : What You Need to Know

This CVE-2023-27585 involves a buffer overflow vulnerability in the PJSIP multimedia communication library, specifically affecting applications that utilize the PJSIP DNS resolver in versions 2.13 and earlier. It does not impact PJSIP users who do not make use of the PJSIP DNS resolver.

Understanding CVE-2023-27585

This section will delve into the details of CVE-2023-27585, highlighting its nature and impact on affected systems.

What is CVE-2023-27585?

CVE-2023-27585 is a buffer overflow vulnerability present in versions 2.13 and prior of the PJSIP multimedia communication library. Specifically, the issue arises in the parsing of the query record

parse_query()

. It differs from a similar vulnerability, CVE-2022-24793, which affected the

parse_rr()

function.

The Impact of CVE-2023-27585

The vulnerability poses a high impact on the availability of affected systems. Attackers could potentially exploit this flaw to execute malicious code or cause a denial of service.

Technical Details of CVE-2023-27585

In this section, we will discuss the vulnerability description, affected systems and versions, as well as the exploitation mechanism of CVE-2023-27585.

Vulnerability Description

CVE-2023-27585 is categorized under two Common Weakness Enumeration (CWE) types: CWE-122 (Heap-based Buffer Overflow) and CWE-120 (Buffer Copy without Checking Size of Input).

Affected Systems and Versions

The vulnerability affects versions of the PJSIP library up to and including 2.13 that incorporate the PJSIP DNS resolver.

Exploitation Mechanism

The buffer overflow vulnerability in CVE-2023-27585 can be exploited by crafting specific queries that trigger the overflow during the parsing process.

Mitigation and Prevention

To address CVE-2023-27585, it is crucial to implement immediate steps to mitigate its impact and adopt long-term security practices to prevent similar vulnerabilities in the future.

Immediate Steps to Take

Apply the patch available as commit

d1c5e4d

in the

master

branch of PJSIP to address the vulnerability.
Alternatively, disable DNS resolution in the PJSIP configuration by setting

nameserver_count

to zero, or consider using an external resolver implementation.

Long-Term Security Practices

Regularly update the PJSIP library and related dependencies to ensure that known vulnerabilities are patched promptly. Additionally, conduct thorough security assessments and code reviews to identify and mitigate potential risks.

Patching and Updates

Stay informed about security advisories and updates from PJSIP to promptly implement any patches or mitigations provided to address vulnerabilities like CVE-2023-27585. Regularly monitoring security mailing lists and vendor advisories can aid in staying ahead of potential threats.