Integer Overflow Vulnerability in libjbcrypt-java: Potential Exposure of Password Hashes
Summary
DEBIAN-CVE-2015-0886: Integer overflow in the crypt_raw method in the key-stretching implementation in jBCrypt before 0.4 makes it easier for remote attackers to determine cleartext values of password hashes via a brute-force attack against h... Affects libjbcrypt-java versions < 0.4-1. Fixed in 0.4-1. How to fix ↓
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Background
libjbcrypt-java is a Java library that implements the bcrypt password hashing function, designed to securely store passwords by applying a key-stretching technique. This library is widely used in applications requiring secure password management. However, a vulnerability in its crypt_raw method can lead to serious security risks, particularly in how it handles password hashes.
Vulnerability Detail
The vulnerability identified as DEBIAN-CVE-2015-0886 arises from an integer overflow in the crypt_raw method of jBCrypt versions prior to 0.4. This flaw allows remote attackers to exploit the key-stretching implementation, making it easier to determine the cleartext values of password hashes through brute-force attacks. The issue is particularly concerning when hashes are associated with the maximum exponent, which can significantly weaken password security.
How To Fix
Minimum fixed version
0.4-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade libjbcrypt-javaTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, consider implementing additional security measures such as rate limiting login attempts or using a more secure password hashing library until the package can be updated.
Conclusion
The integer overflow vulnerability in libjbcrypt-java poses a significant risk to password security, allowing potential exposure of cleartext passwords. It is crucial to update to the patched version 0.4-1 to mitigate this risk. Additionally, employing temporary workarounds can help protect against exploitation until the update is applied.
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FAQ
The integer overflow vulnerability can allow attackers to perform brute-force attacks on password hashes, potentially exposing users' cleartext passwords.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
All versions of libjbcrypt-java prior to 0.4 are affected by this vulnerability.
Yes, the patched version of libjbcrypt-java is 0.4-1. Updating to this version will resolve the vulnerability.
If an immediate update is not possible, consider implementing security measures such as rate limiting and monitoring for unusual login attempts.
References
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