PT-2002-1840 · Freebsd · Freebsd Kernel

Published 2002-08-02 · Updated 2016-10-18 · CVE-2002-0820

Positive Technologies (AI Summary)

CVSS v2.0

7.2

High

Base vector

AV:L/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions: FreeBSD kernel version 4.6 and earlier

Description: The issue allows local users to potentially reuse file descriptors in a setuid or setgid program, which could lead to modifying critical data and gaining privileges. This occurs because the FreeBSD kernel closes the file descriptors 0, 1, and 2 after they have been assigned to /dev/null when the descriptors reference procfs or linprocfs.

Recommendations: For FreeBSD kernel version 4.6 and earlier, consider restricting access to setuid or setgid programs that utilize file descriptors referencing procfs or linprocfs until a patch is available. As a temporary workaround, avoid using setuid or setgid programs that could be exploited through this issue. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2002-0820

Affected Products

Freebsd Kernel

References · 5

• http://archives.neohapsis.com/archives/vulnwatch/2002-q3/0047.html · Vendor Advisory
• ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02:23.stdio.asc · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2002-0820 · Security Note
• http://marc.info/?l=bugtraq&m=102979180524452&w=2 · Note
• http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&frame=right&th=d429cd2ef1d3a2b7&seekm=ai6c0q%242289%241%40FreeBSD.csie.NCTU.edu.tw#link16 · Note