SunOS sendmail 5.59 through 5.65 uses popen to process a forwarding host argument, which allows local users to gain root privileges by modifying the IFS (Internal Field Separator) variable and passing crafted values to the -oR option.
http://www.kb.cert.org/vuls/id/3278
http://www.cert.org/advisories/CA-95.11.sun.sendmail-oR.vul
http://www.securityfocus.com/bid/7829
http://www.auscert.org.au/render.html?it=1853&cid=1978
http://www.alw.nih.gov/Security/8lgm/8lgm-Advisory-21.html
Source: Mitre, NVD
Published: 1995-08-23
Updated: 2026-06-16
Base Score: 7.2
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
Severity: High
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.00127