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Insecure Library Loading
Not critical

EncFS Multiple Weaknesses

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Release Date:  2010-08-30    Last Update:  2010-09-16    Views:  2,485

Secunia Advisory SA41158

Where:

From remote

Impact:

Security Bypass, Brute force, Exposure of system information

Solution Status:

Partial Fix

CVE Reference(s):

Description


Micha Riser has reported some weaknesses in EncFS, which can be exploited by malicious people to bypass certain security features.

1) The application uses only 4 bytes as initialisation vector although 8 bytes are intended, which can lead to e.g. lower cryptographic security than expected.

2) The application does not properly protect against "watermarking" attacks when using the CBC mode, which can be exploited to e.g. determine if a specially crafted file has been stored.

3) When using CFB cipher mode, cipher blocks containing a single byte can disclose certain information about the file content to the attacker.

The weaknesses are reported in versions prior to 1.7. Other versions may also be affected.


Solution:
Update to version 1.7, which fixes weaknesses #1 and #2 by using a different initialisation vector setup code for new file systems. Use the "MAC block headers" or "MAC random bytes" options to mitigate the CFB cipher mode attacks.

Provided and/or discovered by:
Micha Riser

Original Advisory:
Micha Riser:
http://archives.neohapsis.com/archives/fulldisclosure/2010-08/0316.html

EncFS:
http://www.arg0.net/encfs#TOC-Change-Log

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: EncFS Multiple Weaknesses

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