Buffer Overrun Vulnerability in OpenSC Package: CVE-2023-2977
Summary
CVE-2023-2977: A vulnerbility was found in OpenSC. Affects opensc across 2 version ranges.
< 0.21.0-1+deb11u1
< 5497519ea6b4af596628f8f8f2f904bacaa3148f
Fixed in 0.21.0-1+deb11u1. How to fix ↓
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Background
OpenSC is an open-source project that provides a set of libraries and utilities for working with smart cards. It supports various smart card standards and is widely used in applications requiring secure authentication and data storage. The package is crucial for developers and organizations that rely on smart card technology for secure transactions and identity verification. However, it has been identified to have a significant vulnerability that could compromise its functionality and security.
Vulnerability Detail
A vulnerability was found in OpenSC, specifically in the pkcs15 cardos_have_verifyrc_package function. This security flaw leads to a buffer overrun due to incorrect calculations of the remaining length of an ASN1 buffer. An attacker can exploit this by supplying a malformed smart card package, which can result in a heap-based buffer out-of-bounds read. If AddressSanitizer (ASAN) is enabled during compilation, this vulnerability can cause a crash, potentially leading to information leaks or further damage.
How To Fix
Minimum fixed version
0.21.0-1+deb11u1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade openscTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users can disable the use of the affected function if possible, or avoid using smart card packages that are not verified or trusted until the package is updated.
Conclusion
The CVE-2023-2977 vulnerability in the OpenSC package poses a significant risk due to its potential for exploitation through buffer overrun. Users are strongly advised to update their OpenSC installations to the latest version to mitigate this risk. Additionally, utilizing tools like Vulert can help monitor and alert for such vulnerabilities in real-time.
See every vulnerability recorded for opensc →
FAQ
CVE-2023-2977 is a buffer overrun vulnerability found in the OpenSC package that can be exploited through malformed ASN1 contexts in smart card packages.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Exploitation of this vulnerability can lead to crashes, information leaks, and potentially allow attackers to execute arbitrary code.
Yes, updating to OpenSC version 0.23.0-0.3 or later will resolve this vulnerability.
If an immediate update is not possible, consider implementing workarounds such as disabling the affected functionality or avoiding untrusted smart card packages.
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