The sys_amd64 IRET Handler in the kernel in FreeBSD 9.3 and 10.1 allows local users to gain privileges or cause a denial of service (kernel panic).

According to its self-reported version number, the remote pfSense install is prior to 2.2.5. It is, therefore, affected by multiple vulnerabilities as stated in the referenced vendor advisories.

If the kernel-mode IRET instruction generates an #SS or #NP exception, but the exception handler does not properly ensure that the right GS register base for kernel is reloaded, the userland GS segment may be used in the context of the kernel exception handler. Impact : By causing an IRET with #SS or #NP exceptions, a local attacker can cause the kernel to use an arbitrary GS base, which may allow escalated privileges or panic the system.

ID	Name	Product	Family	Severity
106497	pfSense < 2.2.5 Multiple Vulnerabilities (SA-15_08)	Nessus	Firewalls	high
92895	FreeBSD : FreeBSD -- Local privilege escalation in IRET handler (0dfa5dde-600a-11e6-a6c3-14dae9d210b8)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2015-5675

high

Tenable Plugins

high

high