Description
The version of Sendmail 8.13.1-2 on Red Hat Enterprise Linux 4 Update 4 and earlier does not reject the "localhost.localdomain" domain name for e-mail messages that come from external hosts, which might allow remote attackers to spoof messages.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | sendmail +3 | 8.13.8-8.el5 | RHSA-2010:0237 |
| RHEL 4 | sendmail +3 | 8.13.1-3.2.el4 | RHSA-2007:0252 |
Advisories 2
- RHSA-2010:0237 Red Hat Security Advisory: sendmail security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2007:0252 Red Hat Security Advisory: sendmail security and bug fix update Red Hat Security Advisories (RHSA) · Jun 26, 2026
References
- 25098 third-party-advisory
- https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=171838
- RHSA-2007:0252 vendor-advisory
- 25743 third-party-advisory
- http://support.avaya.com/elmodocs2/security/ASA-2007-248.htm
- oval:org.mitre.oval:def:11499 vdb-entry signature
- 23742 vdb-entry