FreeBSD pseudo DOFs NULL pointer reference Local Privilege Escalation Vulnerability

Source: Internet
Author: User

Release date: 2010-09-08
Updated on: 2010-09-09

Affected Systems:
FreeBSD 7.2
FreeBSD 7.1
FreeBSD 7.0
Bugtraq id: 43060

FreeBSD is an open-source Unix system that runs on the Intel Platform and can be freely used.

From FreeBSD 5.0 onwards, the system supports POSIX extension attributes and allows the storage of file-related metadata. One file system that supports extension attributes is pseudo. Because of the pseudo call to pfs_unlock () in pfs_getattr (), a null pointer may be referenced after the extattr_get_attribute () call to the pseudo DOFs vnode. By allocating the memory page at the 0x0 address, attackers can overwrite any kernel memory, resulting in crash or root privilege elevation.

<* Source: Przemyslaw Frasunek (

Link: /? L = full-disclosure & m = 128395547127046 & w = 2

Vendor patch:

The vendor has released a patch to fix this security problem. Please download it from the vendor's homepage:

Http:// View = revision & revision = 196689

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.