CVE-2023-3635 is a medium severity vulnerability found in the Okio library developed by Squareup. This vulnerability allows an attacker to exploit the GzipSource class, which does not handle exceptions properly when parsing a malformed gzip buffer. As a result, this may lead to denial of service (DoS) of the Okio client when it attempts to process a crafted GZIP archive. The vulnerability was published on July 12, 2023.
With a CVSS score of 5.9, the implications of this vulnerability are significant, particularly as the attack vector is over the network. Attackers may leverage this vulnerability to disrupt services, making it crucial for organizations using the Okio library to address this issue swiftly. The complexity of the attack is rated as high, meaning that it may require specific conditions or knowledge to successfully exploit the vulnerability.
Organizations should prioritize patching immediately to avoid potential service disruptions. The availability impact is rated as high, meaning that successful exploitation could lead to significant downtime.
As of now, there is an exploit available for this vulnerability, which increases the urgency for organizations to implement the necessary patches and updates to their systems.
In summary, CVE-2023-3635 is a notable vulnerability that organizations should not overlook, given its potential to cause denial of service through the exploitation of the Okio library.
Vulnerability Details
The vulnerability arises from the GzipSource class which fails to manage exceptions raised from malformed gzip buffers, allowing attackers to crash the application by sending malformed data.
This issue is classified under CWE-195 (Improper Handling of Exceptional Conditions) and CWE-681 (Incorrect Conversion between Numeric Types). The CVSS score from NVD is 7.5, indicating a high severity, while JFrog rates it at 5.9, marking it as medium. The difference in scoring might be attributed to differing interpretations of the attack complexity and required privileges.
The vulnerability affects versions of the Okio library from 0.5.0 to below 1.17.6 and from 2.0.0 to below 3.4.0.
Technical Analysis
The root cause of CVE-2023-3635 lies in the GzipSource class's failure to handle exceptions properly while parsing gzip files. This class is responsible for reading and decompressing GZIP archives, and when an attacker sends a specifically crafted archive, the GzipSource may not be able to parse it correctly, leading to a crash of the Okio client.
The attack vector is network-based, meaning that an attacker needs only to send malicious data over the network to trigger the vulnerability. The attack complexity is high, indicating that the attacker must have knowledge of the specific conditions under which the vulnerability can be exploited.
No privileges are required to exploit this vulnerability, and user interaction is not necessary. This makes it easier for an attacker to launch an attack without needing to trick a user into taking action.
The impacts of a successful exploit primarily affect availability, as the application may become unresponsive or crash entirely. There are no confidentiality or integrity impacts associated with this vulnerability.
Risk & Impact Analysis
The potential impact of CVE-2023-3635 on organizations is considerable. As many applications rely on the Okio library for handling GZIP archives, the risk of denial of service could lead to significant service interruptions. This is particularly critical for services that depend on the timely processing of data.
The availability impact is rated high, which means the consequences of an exploit could be severe, leading to outages and service disruptions. Organizations should assess their dependencies on the Okio library and prioritize remediation efforts accordingly.
Given its medium severity score and the availability impact, organizations should address this vulnerability in their priority patch cycle to ensure continued service availability and reliability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects Okio versions from 0.5.0 up to, but not including, 1.17.6, and from 2.0.0 up to, but not including, 3.4.0. Organizations utilizing these versions are strongly encouraged to upgrade to patched versions to mitigate the effects of this vulnerability.
Mitigation & Remediation
To remediate CVE-2023-3635, organizations should upgrade to the latest version of the Okio library. The patched versions should be verified against the vulnerability to ensure that the issue is resolved.
In situations where immediate upgrading is not feasible, organizations can implement workarounds, such as applying input validation to check for malformed GZIP data before processing it. Additionally, network controls can be put in place to restrict access to services that utilize the vulnerable library.
For further assistance, organizations may consider engaging in penetration testing to evaluate the security of their applications.
Detection Guidance
Organizations should monitor logs for any unusual behavior associated with the Okio library, particularly in areas related to GZIP processing. Indicators of compromise may include unexpected crashes or service interruptions.
Behavioral anomalies, such as a sudden increase in requests to GZIP endpoints, may also indicate attempts to exploit this vulnerability. Implementing network signatures to detect malformed GZIP data can further enhance security.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-3635 lies in its reflection of broader trends in application security, particularly concerning how libraries handle malformed input. As software composition continues to grow, ensuring that third-party libraries are secure becomes a critical component of application security.
Security teams should take this vulnerability as a lesson to implement rigorous testing and validation of input handling within their applications. Regular security assessments and engagement with penetration testing methodologies can help identify weaknesses in software dependencies.
Additionally, organizations should consider adopting a vulnerability management program to continuously track and address vulnerabilities as they arise.
As the threat landscape evolves, remaining vigilant and proactive in security practices is essential to protect against vulnerabilities like CVE-2023-3635.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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