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NTP < 4.2.8p2, 4.3.x < 4.3.12 Keygen Vulnerability

Information

Severity

Severity

Medium

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Patch

Created

Created

2 years ago

Modified

Modified

2 years ago

Summary

NTP is prone to a vulnerability in ntp-keygen.

Insight

Insight

ntp-keygen does not generate MD5 keys with sufficient entropy on big endian machines when the lowest order byte of the temp variable is between 0x20 and 0x7f and not #, which might allow remote attackers to obtain the value of generated MD5 keys via a brute force attack with the 93 possible keys.

Affected Software

Affected Software

NTPd versions prior to 4.2.8p2 and 4.3.x before 4.3.12.

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

Update to version 4.2.8p2 or later.

Common Vulnerabilities and Exposures (CVE)