CVE-2013-0294

packet.py in pyrad before 2.1 uses weak random numbers to generate RADIUS authenticators and hash passwords, which makes it easier for remote attackers to obtain sensitive information via a brute force attack.

Weakness

The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.

Affected Software

Potential Mitigations

• Use a well-vetted algorithm that is currently considered to be strong by experts in the field, and select well-tested implementations with adequate length seeds.
• In general, if a pseudo-random number generator is not advertised as being cryptographically secure, then it is probably a statistical PRNG and should not be used in security-sensitive contexts.
• Pseudo-random number generators can produce predictable numbers if the generator is known and the seed can be guessed. A 256-bit seed is a good starting point for producing a “random enough” number.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/112.html
• https://cwe.mitre.org/data/definitions/485.html
• https://cwe.mitre.org/data/definitions/59.html

References

• http://lists.fedoraproject.org/pipermail/package-announce/2013-September/115677.html
• http://lists.fedoraproject.org/pipermail/package-announce/2013-September/115705.html
• http://lists.fedoraproject.org/pipermail/package-announce/2013-September/116567.html
• http://www.openwall.com/lists/oss-security/2013/02/15/13
• http://www.securityfocus.com/bid/57984
• https://bugzilla.redhat.com/show_bug.cgi?id=911682
• https://exchange.xforce.ibmcloud.com/vulnerabilities/82133
• https://github.com/wichert/pyrad/commit/38f74b36814ca5b1a27d9898141126af4953bee5