On Mon, May 13, 2019 at 08:06:37PM +0800, Weilong Chen wrote: > On 2019/5/13 19:49, Michal Kubecek wrote: > > One idea is that there may be applications using current time as a seed > > for random number generator - but then such application is the real > > problem, not having correct time. > > > Yes, the target computer responded to an ICMP timestamp request. By > accurately determining the target's clock state, an attacker can more > effectively attack certain time-based pseudorandom number generators (PRNGs) > and the authentication systems that rely on them. > > So, the 'time' may become sensitive information. The OS should not leak it > out.
So you are effectively saying that having correct time is a security vulnerability? I'm sorry but I cannot agree with that. Seeding PRNG with current time is known to be a bad practice and if some application does it, the solution is to fix the application, not obfuscating system time. Michal Kubecek
