|
|
@ -0,0 +1,143 @@ |
|
|
|
From 410a6ce5c80dd981c22752da034f2529b5eee844 Mon Sep 17 00:00:00 2001 |
|
|
|
From: sebres <serg.brester@sebres.de> |
|
|
|
Date: Mon, 21 Jun 2021 17:12:53 +0200 |
|
|
|
Subject: [PATCH] fixed possible RCE vulnerability, unset escape variable |
|
|
|
(default tilde) stops consider "~" char after new-line as composing escape |
|
|
|
sequence |
|
|
|
|
|
|
|
---
|
|
|
|
config/action.d/complain.conf | 2 +- |
|
|
|
config/action.d/dshield.conf | 2 +- |
|
|
|
config/action.d/mail-buffered.conf | 8 ++++---- |
|
|
|
config/action.d/mail-whois-lines.conf | 2 +- |
|
|
|
config/action.d/mail-whois.conf | 6 +++--- |
|
|
|
config/action.d/mail.conf | 6 +++--- |
|
|
|
6 files changed, 13 insertions(+), 13 deletions(-) |
|
|
|
|
|
|
|
--- a/config/action.d/complain.conf
|
|
|
|
+++ b/config/action.d/complain.conf
|
|
|
|
@@ -102,7 +102,7 @@ logpath = /dev/null
|
|
|
|
# Notes.: Your system mail command. Is passed 2 args: subject and recipient |
|
|
|
# Values: CMD |
|
|
|
# |
|
|
|
-mailcmd = mail -s
|
|
|
|
+mailcmd = mail -E 'set escape' -s
|
|
|
|
|
|
|
|
# Option: mailargs |
|
|
|
# Notes.: Additional arguments to mail command. e.g. for standard Unix mail: |
|
|
|
--- a/config/action.d/dshield.conf
|
|
|
|
+++ b/config/action.d/dshield.conf
|
|
|
|
@@ -179,7 +179,7 @@ tcpflags =
|
|
|
|
# Notes.: Your system mail command. Is passed 2 args: subject and recipient |
|
|
|
# Values: CMD |
|
|
|
# |
|
|
|
-mailcmd = mail -s
|
|
|
|
+mailcmd = mail -E 'set escape' -s
|
|
|
|
|
|
|
|
# Option: mailargs |
|
|
|
# Notes.: Additional arguments to mail command. e.g. for standard Unix mail: |
|
|
|
--- a/config/action.d/mail-buffered.conf
|
|
|
|
+++ b/config/action.d/mail-buffered.conf
|
|
|
|
@@ -17,7 +17,7 @@ actionstart = printf %%b "Hi,\n
|
|
|
|
The jail <name> has been started successfully.\n |
|
|
|
Output will be buffered until <lines> lines are available.\n |
|
|
|
Regards,\n |
|
|
|
- Fail2Ban"|mail -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
|
|
|
|
+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
|
|
|
|
|
|
|
|
# Option: actionstop |
|
|
|
# Notes.: command executed at the stop of jail (or at the end of Fail2Ban) |
|
|
|
@@ -28,13 +28,13 @@ actionstop = if [ -f <tmpfile> ]; then
|
|
|
|
These hosts have been banned by Fail2Ban.\n |
|
|
|
`cat <tmpfile>` |
|
|
|
Regards,\n |
|
|
|
- Fail2Ban"|mail -s "[Fail2Ban] <name>: Summary from <fq-hostname>" <dest>
|
|
|
|
+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: Summary from <fq-hostname>" <dest>
|
|
|
|
rm <tmpfile> |
|
|
|
fi |
|
|
|
printf %%b "Hi,\n |
|
|
|
The jail <name> has been stopped.\n |
|
|
|
Regards,\n |
|
|
|
- Fail2Ban"|mail -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
|
|
|
|
+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
|
|
|
|
|
|
|
|
# Option: actioncheck |
|
|
|
# Notes.: command executed once before each actionban command |
|
|
|
@@ -55,7 +55,7 @@ actionban = printf %%b "`date`: <ip> (<f
|
|
|
|
These hosts have been banned by Fail2Ban.\n |
|
|
|
`cat <tmpfile>` |
|
|
|
\nRegards,\n |
|
|
|
- Fail2Ban"|mail -s "[Fail2Ban] <name>: Summary" <dest>
|
|
|
|
+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: Summary" <dest>
|
|
|
|
rm <tmpfile> |
|
|
|
fi |
|
|
|
|
|
|
|
--- a/config/action.d/mail-whois-lines.conf
|
|
|
|
+++ b/config/action.d/mail-whois-lines.conf
|
|
|
|
@@ -72,7 +72,7 @@ actionunban =
|
|
|
|
# Notes.: Your system mail command. Is passed 2 args: subject and recipient |
|
|
|
# Values: CMD |
|
|
|
# |
|
|
|
-mailcmd = mail -s
|
|
|
|
+mailcmd = mail -E 'set escape' -s
|
|
|
|
|
|
|
|
# Default name of the chain |
|
|
|
# |
|
|
|
--- a/config/action.d/mail-whois.conf
|
|
|
|
+++ b/config/action.d/mail-whois.conf
|
|
|
|
@@ -20,7 +20,7 @@ norestored = 1
|
|
|
|
actionstart = printf %%b "Hi,\n |
|
|
|
The jail <name> has been started successfully.\n |
|
|
|
Regards,\n |
|
|
|
- Fail2Ban"|mail -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
|
|
|
|
+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
|
|
|
|
|
|
|
|
# Option: actionstop |
|
|
|
# Notes.: command executed at the stop of jail (or at the end of Fail2Ban) |
|
|
|
@@ -29,7 +29,7 @@ actionstart = printf %%b "Hi,\n
|
|
|
|
actionstop = printf %%b "Hi,\n |
|
|
|
The jail <name> has been stopped.\n |
|
|
|
Regards,\n |
|
|
|
- Fail2Ban"|mail -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
|
|
|
|
+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
|
|
|
|
|
|
|
|
# Option: actioncheck |
|
|
|
# Notes.: command executed once before each actionban command |
|
|
|
@@ -49,7 +49,7 @@ actionban = printf %%b "Hi,\n
|
|
|
|
Here is more information about <ip> :\n |
|
|
|
`%(_whois_command)s`\n |
|
|
|
Regards,\n |
|
|
|
- Fail2Ban"|mail -s "[Fail2Ban] <name>: banned <ip> from <fq-hostname>" <dest>
|
|
|
|
+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: banned <ip> from <fq-hostname>" <dest>
|
|
|
|
|
|
|
|
# Option: actionunban |
|
|
|
# Notes.: command executed when unbanning an IP. Take care that the |
|
|
|
--- a/config/action.d/mail.conf
|
|
|
|
+++ b/config/action.d/mail.conf
|
|
|
|
@@ -16,7 +16,7 @@ norestored = 1
|
|
|
|
actionstart = printf %%b "Hi,\n |
|
|
|
The jail <name> has been started successfully.\n |
|
|
|
Regards,\n |
|
|
|
- Fail2Ban"|mail -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
|
|
|
|
+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
|
|
|
|
|
|
|
|
# Option: actionstop |
|
|
|
# Notes.: command executed at the stop of jail (or at the end of Fail2Ban) |
|
|
|
@@ -25,7 +25,7 @@ actionstart = printf %%b "Hi,\n
|
|
|
|
actionstop = printf %%b "Hi,\n |
|
|
|
The jail <name> has been stopped.\n |
|
|
|
Regards,\n |
|
|
|
- Fail2Ban"|mail -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
|
|
|
|
+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
|
|
|
|
|
|
|
|
# Option: actioncheck |
|
|
|
# Notes.: command executed once before each actionban command |
|
|
|
@@ -43,7 +43,7 @@ actionban = printf %%b "Hi,\n
|
|
|
|
The IP <ip> has just been banned by Fail2Ban after |
|
|
|
<failures> attempts against <name>.\n |
|
|
|
Regards,\n |
|
|
|
- Fail2Ban"|mail -s "[Fail2Ban] <name>: banned <ip> from <fq-hostname>" <dest>
|
|
|
|
+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: banned <ip> from <fq-hostname>" <dest>
|
|
|
|
|
|
|
|
# Option: actionunban |
|
|
|
# Notes.: command executed when unbanning an IP. Take care that the |