TCPDF Vulnerability CVE-2024-56522: Insecure Hash Comparison in unserializeTCPDFtag
Summary
CVE-2024-56522: An issue was discovered in TCPDF before 6.8.0. Affects tcpdf across 2 version ranges.
< 6.3.5+dfsg1-1+deb11u1
< d54b97cec33f4f1a5ad81119a82085cad93cec89
Fixed in 6.3.5+dfsg1-1+deb11u1. How to fix ↓
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Background
TCPDF is a popular open-source PHP library used for generating PDF documents. It provides a wide range of features including support for various fonts, images, and page formats. However, prior to version 6.8.0, TCPDF had a vulnerability in its unserializeTCPDFtag function, which could lead to security issues due to improper hash comparison.
Vulnerability Detail
The vulnerability arises from the use of loose comparison (!=) in the unserializeTCPDFtag function, which does not utilize a constant-time function for comparing TCPDF tag hashes. This can potentially allow an attacker to exploit the comparison mechanism, leading to unauthorized access or manipulation of data. The issue is particularly concerning as it can be exploited in scenarios where user input is processed, making it critical to address.
How To Fix
Minimum fixed version
6.3.5+dfsg1-1+deb11u1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade tcpdfTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid using the unserializeTCPDFtag function with untrusted input until the package is updated. Additionally, consider implementing input validation to sanitize any data processed by this function.
Conclusion
In summary, CVE-2024-56522 is a significant vulnerability in the TCPDF library that can lead to security risks due to improper hash comparison. It is crucial for users to update to the latest version to mitigate these risks and ensure the security of their applications.
See every vulnerability recorded for tcpdf →
FAQ
CVE-2024-56522 is a security vulnerability in TCPDF that involves improper hash comparison in the unserializeTCPDFtag function.
TCPDF versions prior to 6.8.0 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 risks include unauthorized access and manipulation of data, which can compromise the integrity and security of applications using TCPDF.
Yes, a patch is available in TCPDF version 6.8.0 and later. It is recommended to update to this version or newer.
References
Related vulnerabilities
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