Out-of-Bounds Read Vulnerability in libidn: CVE-2016-6262
Summary
ALPINE-CVE-2016-6262: idn in libidn before 1.33 might allow remote attackers to obtain sensitive memory information by reading a zero byte as input, which triggers an out-of-bounds read, a different vulnerability than CVE-2015-8948. Affects libidn versions < 1.33-r0. Fixed in 1.33-r0. How to fix ↓
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Background
libidn is a library that implements the Internationalized Domain Names (IDN) protocol, allowing applications to handle domain names in various languages. It is widely used in network applications to support internationalization. The library's functionality is crucial for enabling users to access websites with non-ASCII characters in their domain names. However, prior to version 1.33, libidn was susceptible to a vulnerability that could lead to sensitive information disclosure.
Vulnerability Detail
The vulnerability identified as CVE-2016-6262 arises from an out-of-bounds read condition in the idn function of libidn versions before 1.33. This flaw allows remote attackers to exploit the library by sending a zero byte as input, which can trigger an out-of-bounds read and potentially expose sensitive memory information. The ramifications of this vulnerability include unauthorized access to sensitive data, which could be leveraged for further attacks or exploitation.
How To Fix
Minimum fixed version
1.33-r0
This is the first release that contains the fix.
sudo apk add --upgrade libidnTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, you can restrict the input to the idn function to avoid sending zero bytes. However, this does not fully mitigate the risk and should not be considered a permanent solution.
Conclusion
CVE-2016-6262 is a significant vulnerability in the libidn library that can lead to sensitive information disclosure. It is crucial for users and developers to update to the patched version to mitigate risks. Utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
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FAQ
CVE-2016-6262 is a vulnerability in the libidn library that allows remote attackers to read sensitive memory information due to an out-of-bounds read condition.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
The CVSS score for CVE-2016-6262 is 7.5, indicating a high severity level.
If immediate updates are not possible, consider implementing input restrictions as a temporary workaround, but plan to update as soon as feasible.
More information about libidn can be found on its official documentation and repositories, which provide insights into its functionality and usage.
References
Related vulnerabilities
Recent vulnerabilities recorded for libidn.
