Sensitive Information Exposure in Curl Package - CVE-2017-7407
Summary
ALPINE-CVE-2017-7407: The ourWriteOut function in tool_writeout.c in curl 7.53.1 might allow physically proximate attackers to obtain sensitive information from process memory in opportunistic circumstances by reading a workstation screen dur... Affects curl versions < 7.53.1-r2. Fixed in 7.53.1-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. The tool is essential for developers and system administrators for tasks such as downloading files, testing APIs, and automating web interactions. However, a vulnerability identified as CVE-2017-7407 has been discovered in Curl versions prior to 7.53.1-r2, which could expose sensitive information under certain conditions.
Vulnerability Detail
The vulnerability stems from the ourWriteOut function in tool_writeout.c within Curl version 7.53.1. It allows physically proximate attackers to obtain sensitive information from process memory by reading a workstation screen during the use of a --write-out argument that ends with a '%' character. This leads to a heap-based buffer over-read, potentially exposing sensitive data to unauthorized users. The CVSS score for this vulnerability is 2.4, indicating a low severity but still a risk that should be addressed.
How To Fix
Minimum fixed version
7.53.1-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
As a temporary workaround, avoid using the --write-out argument with a '%' character until the package is updated. This can help mitigate the risk of exposing sensitive information during usage.
Conclusion
CVE-2017-7407 is a vulnerability in the Curl package that can lead to sensitive information exposure. Users are encouraged to update to the patched version to ensure their systems are secure. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2017-7407 is a vulnerability in the Curl package that allows attackers to potentially read sensitive information from process memory.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If exploited, this vulnerability could allow unauthorized users to access sensitive information displayed on the screen during the use of Curl.
Yes, a patch is available in Curl version 7.53.1-r2 and later. It is recommended to update to this version to mitigate the vulnerability.
If you cannot update Curl immediately, avoid using the --write-out argument with a '%' character as a temporary workaround.
References
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