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156 lines
6.9 KiB
156 lines
6.9 KiB
3 years ago
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From 410a6ce5c80dd981c22752da034f2529b5eee844 Mon Sep 17 00:00:00 2001
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From: sebres <serg.brester@sebres.de>
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Date: Mon, 21 Jun 2021 17:12:53 +0200
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Subject: [PATCH] fixed possible RCE vulnerability, unset escape variable
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(default tilde) stops consider "~" char after new-line as composing escape
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sequence
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---
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config/action.d/complain.conf | 2 +-
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config/action.d/dshield.conf | 2 +-
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config/action.d/mail-buffered.conf | 8 ++++----
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config/action.d/mail-whois-lines.conf | 2 +-
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config/action.d/mail-whois.conf | 6 +++---
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config/action.d/mail.conf | 6 +++---
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6 files changed, 13 insertions(+), 13 deletions(-)
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diff --git a/config/action.d/complain.conf b/config/action.d/complain.conf
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index 3a5f882c9f..4d73b05859 100644
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--- a/config/action.d/complain.conf
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+++ b/config/action.d/complain.conf
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@@ -102,7 +102,7 @@ logpath = /dev/null
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# Notes.: Your system mail command. Is passed 2 args: subject and recipient
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# Values: CMD
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#
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-mailcmd = mail -s
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+mailcmd = mail -E 'set escape' -s
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# Option: mailargs
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# Notes.: Additional arguments to mail command. e.g. for standard Unix mail:
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diff --git a/config/action.d/dshield.conf b/config/action.d/dshield.conf
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index c128bef348..3d5a7a53a9 100644
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--- a/config/action.d/dshield.conf
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+++ b/config/action.d/dshield.conf
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@@ -179,7 +179,7 @@ tcpflags =
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# Notes.: Your system mail command. Is passed 2 args: subject and recipient
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# Values: CMD
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#
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-mailcmd = mail -s
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+mailcmd = mail -E 'set escape' -s
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# Option: mailargs
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# Notes.: Additional arguments to mail command. e.g. for standard Unix mail:
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diff --git a/config/action.d/mail-buffered.conf b/config/action.d/mail-buffered.conf
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index 325f185b2f..79b841049c 100644
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--- a/config/action.d/mail-buffered.conf
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+++ b/config/action.d/mail-buffered.conf
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@@ -17,7 +17,7 @@ actionstart = printf %%b "Hi,\n
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The jail <name> has been started successfully.\n
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Output will be buffered until <lines> lines are available.\n
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Regards,\n
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- Fail2Ban"|mail -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
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+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
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# Option: actionstop
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# Notes.: command executed at the stop of jail (or at the end of Fail2Ban)
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@@ -28,13 +28,13 @@ actionstop = if [ -f <tmpfile> ]; then
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These hosts have been banned by Fail2Ban.\n
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`cat <tmpfile>`
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Regards,\n
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- Fail2Ban"|mail -s "[Fail2Ban] <name>: Summary from <fq-hostname>" <dest>
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+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: Summary from <fq-hostname>" <dest>
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rm <tmpfile>
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fi
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printf %%b "Hi,\n
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The jail <name> has been stopped.\n
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Regards,\n
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- Fail2Ban"|mail -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
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+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
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# Option: actioncheck
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# Notes.: command executed once before each actionban command
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@@ -55,7 +55,7 @@ actionban = printf %%b "`date`: <ip> (<failures> failures)\n" >> <tmpfile>
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These hosts have been banned by Fail2Ban.\n
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`cat <tmpfile>`
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\nRegards,\n
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- Fail2Ban"|mail -s "[Fail2Ban] <name>: Summary" <dest>
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+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: Summary" <dest>
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rm <tmpfile>
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fi
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diff --git a/config/action.d/mail-whois-lines.conf b/config/action.d/mail-whois-lines.conf
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index 3a3e56b2c7..d2818cb9b9 100644
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--- a/config/action.d/mail-whois-lines.conf
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+++ b/config/action.d/mail-whois-lines.conf
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@@ -72,7 +72,7 @@ actionunban =
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# Notes.: Your system mail command. Is passed 2 args: subject and recipient
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# Values: CMD
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#
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-mailcmd = mail -s
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+mailcmd = mail -E 'set escape' -s
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# Default name of the chain
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#
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diff --git a/config/action.d/mail-whois.conf b/config/action.d/mail-whois.conf
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index 7fea34c40d..ab33b616dc 100644
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--- a/config/action.d/mail-whois.conf
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+++ b/config/action.d/mail-whois.conf
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@@ -20,7 +20,7 @@ norestored = 1
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actionstart = printf %%b "Hi,\n
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The jail <name> has been started successfully.\n
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Regards,\n
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- Fail2Ban"|mail -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
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+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
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# Option: actionstop
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# Notes.: command executed at the stop of jail (or at the end of Fail2Ban)
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@@ -29,7 +29,7 @@ actionstart = printf %%b "Hi,\n
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actionstop = printf %%b "Hi,\n
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The jail <name> has been stopped.\n
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Regards,\n
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- Fail2Ban"|mail -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
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+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
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# Option: actioncheck
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# Notes.: command executed once before each actionban command
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@@ -49,7 +49,7 @@ actionban = printf %%b "Hi,\n
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Here is more information about <ip> :\n
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`%(_whois_command)s`\n
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Regards,\n
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- Fail2Ban"|mail -s "[Fail2Ban] <name>: banned <ip> from <fq-hostname>" <dest>
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+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: banned <ip> from <fq-hostname>" <dest>
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# Option: actionunban
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# Notes.: command executed when unbanning an IP. Take care that the
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diff --git a/config/action.d/mail.conf b/config/action.d/mail.conf
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index 5d8c0e154c..f4838ddcb6 100644
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--- a/config/action.d/mail.conf
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+++ b/config/action.d/mail.conf
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@@ -16,7 +16,7 @@ norestored = 1
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actionstart = printf %%b "Hi,\n
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The jail <name> has been started successfully.\n
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Regards,\n
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- Fail2Ban"|mail -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
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+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: started on <fq-hostname>" <dest>
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# Option: actionstop
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# Notes.: command executed at the stop of jail (or at the end of Fail2Ban)
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@@ -25,7 +25,7 @@ actionstart = printf %%b "Hi,\n
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actionstop = printf %%b "Hi,\n
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The jail <name> has been stopped.\n
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Regards,\n
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- Fail2Ban"|mail -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
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+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: stopped on <fq-hostname>" <dest>
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# Option: actioncheck
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# Notes.: command executed once before each actionban command
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@@ -43,7 +43,7 @@ actionban = printf %%b "Hi,\n
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The IP <ip> has just been banned by Fail2Ban after
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<failures> attempts against <name>.\n
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Regards,\n
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- Fail2Ban"|mail -s "[Fail2Ban] <name>: banned <ip> from <fq-hostname>" <dest>
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+ Fail2Ban"|mail -E 'set escape' -s "[Fail2Ban] <name>: banned <ip> from <fq-hostname>" <dest>
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# Option: actionunban
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# Notes.: command executed when unbanning an IP. Take care that the
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