Apply the sendmail 8.9.3 denial-of-service patch which prevents untrusted

users from running newaliases.  (This is to protect aliases.db against
truncation).

PR:		15088

1 files changed, 12 insertions, 0 deletions

diff --git a/contrib/sendmail/src/main.c b/contrib/sendmail/src/main.c
index cea9d15..cb6fd57 100644
--- a/contrib/sendmail/src/main.c
+++ b/contrib/sendmail/src/main.c
@@ -984,6 +984,18 @@ main(argc, argv, envp)
 		usrerr("Permission denied");
 		finis(FALSE, EX_USAGE);
 	}
+	if (OpMode == MD_INITALIAS &&
+	    RealUid != 0 &&
+	    RealUid != TrustedUid &&
+	    !wordinclass(RealUserName, 't'))
+	{
+		if (LogLevel > 1)
+			sm_syslog(LOG_ALERT, NOQID,
+				  "user %d attempted to rebuild the alias map",
+				  RealUid);
+ 		usrerr("Permission denied");
+ 		finis(FALSE, EX_USAGE);
+ 	}
 
 	if (MeToo)
 		BlankEnvelope.e_flags |= EF_METOO;