The identified vulnerability, CVE-2024-6874, affects Haxx's libcurl, specifically its URL API function curl_url_get(), which offers punycode conversions between ASCII and Internationalized Domain Names (IDN). This flaw allows for the reading of memory outside of a stack-based buffer when the function is invoked with a name that is exactly 256 bytes in length.
The conversion function fills the provided buffer without properly null-terminating the string. As a result, this can lead to the exposure of stack contents unintentionally being returned as part of the converted string.
This vulnerability has been classified with a CVSS base score of 4.3, indicating a medium severity level. The exploitation of this vulnerability can lead to information disclosure, which could compromise the confidentiality of sensitive data.
The risk to organizations includes potential unauthorized access to sensitive information through the unintended exposure of stack memory contents. Organizations should prioritize patching immediately.
Vulnerability Details
The official description of CVE-2024-6874 highlights that the libcurl URL API function curl_url_get() allows for punycode conversions, and when built to use the *macidn* IDN backend, it can read outside of the allocated buffer. This can lead to stack content leakage.
The vulnerability is classified under CWE-125, which relates to out-of-bounds read vulnerabilities, indicating that the software does not properly validate input before processing.
The CVSS score of 4.3 indicates that the vulnerability has low attack complexity and requires low privileges, underscoring the importance of immediate attention to this issue.
Technical Analysis
The root cause of this vulnerability lies in the buffer handling of the curl_url_get() function, which does not null-terminate the output string when the input size is precisely 256 bytes. This oversight can lead to unintended data exposure.
The attack vector is classified as network-based, implying that an attacker could exploit this vulnerability remotely through malformed requests. The attack complexity is low, requiring minimal skill to exploit.
No user interaction is required for exploitation, and the vulnerability does not impact the integrity or availability of the system, limiting its potential damage.
Risk & Impact Analysis
The risk this vulnerability poses to organizations is substantial, especially for those that utilize the libcurl library in their applications. The potential for unauthorized access to sensitive information due to stack memory exposure must be taken seriously.
Organizations should address this vulnerability in their priority patch cycle to mitigate the risk of data exposure and maintain the integrity of their systems.
The urgency of addressing this vulnerability is underscored by its medium CVSS score, indicating that it should not be overlooked in routine maintenance.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected version of libcurl is 8.8.0.
Mitigation & Remediation
Organizations using libcurl should immediately upgrade to the latest patched version to mitigate this vulnerability. In case a patch is not available, consider implementing configuration hardening measures and network controls to limit exposure.
For further guidance on penetration testing and security best practices, organizations can refer to penetration testing services to identify similar weaknesses.
Detection Guidance
Monitor logs for indicators of abnormal behavior related to libcurl usage. Look for unexpected requests that could indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability highlights the ongoing risks associated with buffer handling in widely used libraries like libcurl. Security teams should ensure thorough testing of third-party components to detect potential vulnerabilities early.
Organizations are encouraged to stay informed about vulnerabilities in their technology stacks and should regularly conduct security assessments such as vulnerability management programs to address new threats.
Given the increasing complexity of software systems, it is essential to adopt a proactive approach to security, ensuring that all components are regularly evaluated for potential weaknesses.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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