Plattform
curl
Komponente
curl
Behoben in
7.51.1
CVE-2016-8623 describes an information disclosure vulnerability discovered in cURL versions 7.51.0. This flaw stems from how cURL handles cookies, allowing other threads to trigger a use-after-free condition. Successful exploitation could lead to the exposure of sensitive information. The vulnerability was published in 2018 and a fix was released in version 7.51.0.
The core of the vulnerability lies in cURL's cookie handling mechanism. Specifically, the way cURL manages cookie data between threads can create a scenario where a thread attempts to access memory that has already been freed. This 'use-after-free' condition can be exploited by a malicious actor to read data from the freed memory location. The potential impact is information disclosure – an attacker could potentially gain access to sensitive data that was previously stored in the memory region, such as authentication tokens, session identifiers, or other confidential information. While the CVSS score is LOW, the potential for data leakage warrants immediate attention, especially in environments where cURL is used to handle sensitive data or interact with untrusted sources.
CVE-2016-8623 was publicly disclosed in 2018. There is no indication of active exploitation campaigns targeting this specific vulnerability. Public proof-of-concept (PoC) code is not widely available, which may limit the immediate risk. This CVE is tracked by the NVD and CISA. The EPSS score is likely low due to the lack of public exploits and active campaigns.
Applications and systems that rely on cURL for making HTTP requests are at risk. This includes web servers, automation scripts, and any software that integrates cURL for data transfer. Systems using older, unpatched versions of cURL are particularly vulnerable, especially those handling sensitive data through cookies.
• linux / server:
ps aux | grep curl
journalctl -u curl | grep -i error• generic web:
curl -I https://example.com # Check response headers for unusual patternsdiscovery
disclosure
Exploit-Status
CVSS-Vektor
The primary mitigation for CVE-2016-8623 is to upgrade to cURL version 7.51.0 or later, which contains the fix for this use-after-free vulnerability. If an immediate upgrade is not feasible due to compatibility issues or system downtime constraints, consider implementing temporary workarounds. While a direct WAF rule is unlikely to prevent this vulnerability, carefully reviewing and restricting cookie handling logic within applications using cURL can reduce the attack surface. Thoroughly test any changes in a non-production environment before deploying to production. After upgrading, confirm the fix by attempting to reproduce the vulnerability using known exploit techniques or by running a vulnerability scanner configured to detect use-after-free conditions in cURL.
Aktualisieren Sie auf Version 7.51.0 oder höher, um das Problem zu beheben. Das Update behebt die Art und Weise, wie cURL Cookies behandelt, und verhindert so die unsachgemäße Verwendung von Speicher und die mögliche Offenlegung von Informationen.
Schwachstellenanalysen und kritische Warnungen direkt in deinen Posteingang.
CVE-2016-8623 is a vulnerability in cURL versions 7.51.0 that allows attackers to trigger a use-after-free condition when handling cookies, potentially leading to information disclosure. The CVSS score is LOW.
You are affected if you are using cURL versions 7.51.0. Check your cURL version and upgrade if necessary.
Upgrade to cURL version 7.51.0 or later to resolve the vulnerability. This fix addresses the use-after-free condition in cookie handling.
While the vulnerability is known, there are no widespread reports of active exploitation. However, it remains a potential risk.
Refer to the cURL security advisories and the NVD entry for detailed information: [https://nvd.nist.gov/vuln/detail/CVE-2016-8623](https://nvd.nist.gov/vuln/detail/CVE-2016-8623)
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