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Posted to dev@directory.apache.org by "Emmanuel Lécharny (Jira)" <ji...@apache.org> on 2021/01/21 08:49:00 UTC
[jira] [Commented] (DIRSERVER-2338) Using a static IV in symmetric
encryption with CBC mode
[ https://issues.apache.org/jira/browse/DIRSERVER-2338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17269126#comment-17269126 ]
Emmanuel Lécharny commented on DIRSERVER-2338:
----------------------------------------------
I agree this is a potential security issue.
AFAICS, this class in only used for tests, but even so, I think we should use a randomly generated IV.
> Using a static IV in symmetric encryption with CBC mode
> -------------------------------------------------------
>
> Key: DIRSERVER-2338
> URL: https://issues.apache.org/jira/browse/DIRSERVER-2338
> Project: Directory ApacheDS
> Issue Type: Improvement
> Reporter: Ya Xiao
> Priority: Major
> Labels: patch, security
>
> *Vulnerability Description*
> In file [directory-server/kerberos-codec/src/main/java/org/apache/directory/server/kerberos/shared/crypto/encryption/DesCbcCrcEncryption.java|[https://github.com/apache/directory-server/blob/master/kerberos-codec/src/main/java/org/apache/directory/server/kerberos/shared/crypto/encryption/DesCbcCrcEncryption.java],] a hardcoded IV (at Line 161) is used to initialize the cipher (at Line 165, Line 169).
> *Security Impact:*
> The IV of CBC mode is expected to be random. The static IV makes the resulting ciphertext much more predictable and susceptible to a dictionary attack.
> *Useful Resources*:
> [https://cwe.mitre.org/data/definitions/338.html|https://cwe.mitre.org/data/definitions/329.html]
> *Solution we suggest*
> Generate the IV bytes through SecureRandom.
> *Please share with us your opinions/comments if there is any*
> Is the bug report helpful?
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