Critical Vulnerability in Curl: Dangling Pointer Issue Leading to Potential Data Misrouting
Summary
ALPINE-CVE-2020-8231: Due to use of a dangling pointer, libcurl 7.29.0 through 7.71.1 can use the wrong connection when sending data. Affects curl versions < 7.66.0-r2. Fixed in 7.66.0-r2. How to fix ↓
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Background
Curl is a widely-used command-line tool and library for transferring data with URLs. It supports various protocols including HTTP, HTTPS, FTP, and more. Curl is integral to many applications and systems for data retrieval and manipulation. However, it has been found to have a critical vulnerability that can lead to unintended data exposure due to improper handling of pointers.
Vulnerability Detail
The vulnerability identified as CVE-2020-8231 affects libcurl versions 7.29.0 through 7.71.1. It originates from the use of a dangling pointer, which can cause libcurl to use the wrong connection when sending data. This flaw can lead to sensitive data being sent to unintended recipients, posing a significant risk to data integrity and confidentiality. The CVSS score for this vulnerability is 7.5, indicating a high severity level.
How To Fix
Minimum fixed version
7.66.0-r2
This is the first release that contains the fix.
sudo apk add --upgrade curlTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate patching is not feasible, consider implementing network-level controls to restrict data transmission until the vulnerability can be addressed. This may include firewall rules or application-level checks to validate data before transmission.
Conclusion
The CVE-2020-8231 vulnerability in Curl poses a significant risk due to a dangling pointer issue that can lead to data being sent to the wrong connection. It is crucial to update to the patched versions of Curl to mitigate this risk. Users should also consider using tools like Vulert to monitor and alert for open-source vulnerabilities in their software.
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FAQ
CVE-2020-8231 is a vulnerability in Curl that arises from a dangling pointer issue, potentially leading to data being sent to the wrong connection.
Libcurl versions 7.29.0 through 7.71.1 are affected by this vulnerability.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
The CVSS score for this vulnerability is 7.5, indicating a high severity level.
If you cannot update Curl immediately, consider implementing network-level controls to restrict data transmission until the vulnerability can be addressed.
References
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