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Amazon Linux Local Check: alas-2016-750

Information

Severity

Severity

Medium

Family

Family

Amazon Linux Local Security Checks

CVSSv2 Base

CVSSv2 Base

4.3

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:M/Au:N/C:P/I:N/A:N

Solution Type

Solution Type

Vendor Patch

Created

Created

7 years ago

Modified

Modified

5 years ago

Summary

Amazon Linux Local Security Checks

Insight

Insight

Ciphers with 64-bit block sizes used in CBC mode were found to be vulnerable to a birthday attack when key renegotiation doesn't happen frequently or at all in long running connections. The blowfish cipher as used in OpenVPN by default is vulnerable to this attack, allowing a remote attacker to recover partial plaintext information (XOR of two plaintext blocks).

Solution

Solution

Run yum update openvpn to update your system.

Common Vulnerabilities and Exposures (CVE)