Title: WinPcap NPF.SYS Bpf_Filter_Init Function Local Privilege Escalation Vulnerability
Severity: HIGH
Description:
WinPcap provides realtime link-level network access on Windows operating systems.
WinPcap is prone to a local privilege-escalation vulnerability because the software fails to adequately bounds-check user-supplied data. Specifically, an attacker can pass invalid array indexes to the 'bpf_filter_init()' function in the 'NPF.SYS' file via specially crafted IOCTL requests. This allows the attacker to overwrite and execute arbitrary kernel memory.
Note that an administrator must load the vulnerable driver ('NPF.SYS') by executing an application that depends on it. By default, the driver is not loaded; it can be loaded only by administrative users.
The attacker can exploit this issue to execute arbitrary code with kernel-level privileges. Successfully exploiting this issue will result in the complete compromise of affected computers.
WinPcap 4.0.1 is vulnerable to this issue; previous versions may also be affected.
Affected Products:
- WinPcap WinPcap 4.0.1
References:
- WinPcap: WinPcap Change Log
- WinPcap: WinPcap Web Site
Juniper Networks provides this content via a wide variety of sources and production methods. If notified of errors or omissions in the content of this page, Juniper Networks, at its discretion, will modify or remove the page or leave the content as is, depending on various factors including but not limited to the reputation and authority of the party providing the notification. Please use the contact information displayed elsewhere on this page to report any errors or omissions regarding the content on this page.
