CVE-2018-1108

kernel drivers before version 4.17-rc1 are vulnerable to a weakness in the Linux kernels implementation of random seed data. Programs, early in the boot sequence, could use the data allocated for the seed before it was sufficiently generated.

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://www.securityfocus.com/bid/104055
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1108
• https://lists.debian.org/debian-lts-announce/2022/07/msg00000.html
• https://usn.ubuntu.com/3718-1/
• https://usn.ubuntu.com/3718-2/
• https://usn.ubuntu.com/3752-1/
• https://usn.ubuntu.com/3752-2/
• https://usn.ubuntu.com/3752-3/
• https://www.debian.org/security/2018/dsa-4188