A flaw was found in glib, where the gvariant deserialization code is vulnerable to a denial of service introduced by additional input validation added to resolve CVE-2023-29499. The offset table validation may be very slow. This bug does not affect any released version of glib but does affect glib distributors who followed the guidance of glib developers to backport the initial fix for CVE-2023-29499.
This vulnerability is classified with a CVSS score of 4.7, indicating a medium severity level. Organizations should address this vulnerability in their patch cycle to prevent potential service disruptions.
Risk to organizations includes the potential for denial of service, which could impact the availability of applications relying on glib. With an exploitability score of medium, it is crucial for organizations to remain vigilant.
Organizations should prioritize patching immediately. The vulnerability was published on September 14, 2023, and has a potential impact on systems that utilize glib.
Vulnerability Details
The CVE-2023-32636 vulnerability is tied to flaws in the gvariant deserialization code within glib, which could lead to denial of service due to slow offset table validation. The CVSS score of 4.7 reflects a medium severity, with the primary attack vector being local. Notably, the vulnerability impacts glib distributors who backported fixes for an earlier issue (CVE-2023-29499).
With a CVSS vector of CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H, the attack complexity is high, requiring low privileges and no user interaction. The availability impact is high, highlighting the risk posed to service uptime.
The vulnerabilities are categorized under CWE-400 and CWE-502, indicating issues with resource exhaustion and deserialization flaws, respectively.
Technical Analysis
The root cause of CVE-2023-32636 stems from inadequate input validation within the gvariant deserialization process. When additional input validation was implemented to fix CVE-2023-29499, it inadvertently introduced a denial of service condition due to slow offset table validation. This flaw does not affect released versions of glib but is a concern for distributors that followed guidance to backport the initial fix.
The attack vector is local, requiring the attacker to have access to the target system. The complexity of the attack is high, meaning that successful exploitation necessitates specific conditions to be met. Privileges required for exploitation are low, while user interaction is not necessary.
The impacts on confidentiality and integrity are none, but the availability impact is rated high, which could disrupt services relying on glib.
Risk & Impact Analysis
Real-world deployment risks include potential service disruptions for applications dependent on glib. High availability impact means that systems could experience extensive downtime if the vulnerability is exploited successfully. Organizations utilizing glib should assess their exposure and prioritize remediation efforts.
Given the medium CVSS score, organizations should include this vulnerability in their priority patch cycle to mitigate associated risks. The known exploitation status indicates that there is currently no public exploit confirmed, but vigilance is necessary as the vulnerability could be exploited in future attacks.
Organizations should prioritize patching immediately, as failure to address this vulnerability could lead to significant disruptions and resource exhaustion.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable configuration includes all versions of glib prior to 2.74.4. Organizations should ensure they are running versions of glib that are not affected by this vulnerability.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply available patches to upgrade to glib version 2.74.4 or later. If a patch is not available, implementing configuration hardening can reduce exposure.
Additionally, organizations may benefit from conducting a thorough security assessment, such as an application security assessment, to identify any weaknesses in their systems.
Detection Guidance
Organizations should monitor logs for any unusual behavior related to glib usage. Behavioral anomalies or performance issues that could indicate denial of service attacks should be investigated promptly.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its impact on service availability. Monitoring trends in similar vulnerabilities can help organizations refine their security posture.
This case illustrates the importance of thorough input validation in software development, reinforcing the need for comprehensive security testing practices.
Organizations are encouraged to enhance their security testing processes by incorporating penetration testing methodologies into their security assessments.
Finally, organizations should stay informed about emerging vulnerabilities and their implications for security strategies, ensuring they are prepared for evolving threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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