Integer Overflow Vulnerability in libjbcrypt-java: CVE-2015-0886
Summary
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, which is designed to securely hash passwords and protect them against brute-force attacks. The library is widely used in applications requiring secure password storage. However, a vulnerability identified as CVE-2015-0886 has been discovered in its key-stretching implementation, which can potentially expose password hashes to remote attackers.
Vulnerability Detail
CVE-2015-0886 is an integer overflow vulnerability found in the crypt_raw method of jBCrypt versions prior to 0.4. This flaw allows remote attackers to exploit the hashing mechanism by determining cleartext values of password hashes through brute-force attacks. The vulnerability arises from improper handling of integer values, which can lead to unexpected behavior and weaken the security of password storage.
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
If an immediate update is not feasible, consider implementing rate limiting on password attempts to mitigate the risk of brute-force attacks. Additionally, you can enhance password complexity requirements to make brute-force attacks more difficult.
Conclusion
The CVE-2015-0886 vulnerability in libjbcrypt-java poses a significant risk to applications that rely on this library for password hashing. It is crucial to update to the latest version to protect against potential brute-force attacks. Additionally, consider implementing workarounds to enhance security until an update can be applied.
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FAQ
CVE-2015-0886 is a vulnerability in the libjbcrypt-java library that allows remote attackers to exploit password hashes through brute-force attacks due to an integer overflow in the key-stretching implementation.
If your application uses libjbcrypt-java for password hashing, it may be susceptible to brute-force attacks, potentially allowing attackers to recover user passwords.
All versions of libjbcrypt-java prior to 0.4 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.
Implement rate limiting on password attempts and enhance password complexity requirements as temporary measures to mitigate the risk of exploitation.
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