As security precaution and to limit the attack surface based on
the version reported by tools like nmap mask out the dropbear
version so the version is not visible anymore by snooping on the
wire. Version is still visible by 'dropbear -V'
Based on a patch by Hans Dedecker <dedeckeh@gmail.com>
Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Signed-off-by: Felix Fietkau <nbd@nbd.name> [remove trailing _]
- Security: Message printout was vulnerable to format string injection.
If specific usernames including "%" symbols can be created on a system
(validated by getpwnam()) then an attacker could run arbitrary code as root
when connecting to Dropbear server.
A dbclient user who can control username or host arguments could potentially
run arbitrary code as the dbclient user. This could be a problem if scripts
or webpages pass untrusted input to the dbclient program.
- Security: dropbearconvert import of OpenSSH keys could run arbitrary code as
the local dropbearconvert user when parsing malicious key files
- Security: dbclient could run arbitrary code as the local dbclient user if
particular -m or -c arguments are provided. This could be an issue where
dbclient is used in scripts.
- Security: dbclient or dropbear server could expose process memory to the
running user if compiled with DEBUG_TRACE and running with -v
The security issues were reported by an anonymous researcher working with
Beyond Security's SecuriTeam Secure Disclosure www.beyondsecurity.com/ssd.html
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Fix a „semantic typo“ introduced in b78aae793e,
where TARGET_INIT_PATH was used instead of CONFIG_TARGET_INIT_PATH.
Signed-off-by: Dario Ernst <Dario.Ernst@riverbed.com>
Update the dropbear package to version 2016.73, refresh patches.
The measured .ipk sizes on an x86_64 build are:
94588 dropbear_2015.71-3_x86_64.ipk
95316 dropbear_2016.73-1_x86_64.ipk
This is an increase of roughly 700 bytes after compression.
Tested-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
The option --disable-utmpx was deleted by accident in commit 7545c1d;
add it again to the CONFIGURE_ARGS list
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
A dropbear instance having an interface config won't start if the interface is down as no
IP address is available.
Adding interface triggers for each configured interface executing the dropbear reload script
will start the dropbear instance when the interface is up.
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
Utmp support tracks who is currenlty logged in by logging info to the file /var/run/utmp (supported by busybox)
Putuline support will use the utmp structure to write to the utmp file
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
While technically required by the RFC, they are usually completely
unused (DSA), or have security issues (3DES, CBC)
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 46814
This enables passworldless login for root via SSH whenever no root
password is set (e.g. after reset, flashing without keeping config
or in failsafe) and removes telnet support alltogether.
Signed-off-by: Steven Barth <steven@midlink.org>
SVN-Revision: 46809
[base-files] shell-scripting: fix wrong usage of '==' operator
normally the '==' is used for invoking a regex parser and is a bashism.
all of the fixes just want to compare a string. the used busybox-ash
will silently "ignore" this mistake, but make it portable/clean at least.
this patch does not change the behavior/logic of the scripts.
Signed-off-by: Bastian Bittorf <bittorf@bluebottle.com>
SVN-Revision: 42911
Use network_get_ipaddrs_all to get all ip-addresses of an interface. If the
function fails, the interface does not exists or has not any suiteable ip
addresses assigned.
Use the returned ip-address(es) to construct the dropbear listen address.
Signed-off-by: Mathias Kresin <openwrt@kresin.me>
SVN-Revision: 42857
somebody started to set a function returncode in the validation
stuff and everybody copies it, e.g.
myfunction()
{
fire_command
return $?
}
a function automatically returns with the last returncode,
so we can safely remove the command 'return $?'. reference:
http://tldp.org/LDP/abs/html/exit-status.html
"The last command executed in the function or script determines the exit status."
Signed-off-by: Bastian Bittorf <bittorf@bluebottle.com>
SVN-Revision: 42278
Disable MIPS16 to prevent it negatively affecting performance.
Observed was a increase of connection delay from ~6 to ~11 seconds
and a reduction of scp speed from 1.1MB/s to 710kB/s on brcm63xx.
Fixes#15209.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
SVN-Revision: 42250
Add a further upstream commit to more closely match the keepalive
to OpenSSH.
Should now really fix#17523.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
SVN-Revision: 42249
Don't send SSH_MSG_UNIMPLEMENTED for keepalive responses, which broke
at least putty.
Fixes#17522 / #17523.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
SVN-Revision: 42162
fixes incremental build with change to CONFIG_DROPBEAR_ECC
drop --with-shared which is unknown to configure
Patch by Catalin Patulea <cat@vv.carleton.ca>
SVN-Revision: 40300
Without timeout mechanism, if ssh client disconnected without sending
FIN or RST, forked dropbear servers would hang there for
KEX_RETRY_TIMEOUT seconds (8 hours).
TCP keepalive is not implemented in dropbear yet, thus the name
SSHKeepAlive.
300 seconds in this patch is selected from the default value of
ServerAliveInterval for Debian ssh client (See man ssh_config).
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
SVN-Revision: 40299
Changes include:
* removing unused variables
* replacing spaces with tabs where appropriate
* more consistency with variable declarations
Signed-off-by: Luka Perkov <luka@openwrt.org>
SVN-Revision: 38142
Upstream has a few code cleanups, more eagerly burns sensitive memory and
includes the fix for CVE-2012-0920. Full changelog:
https://matt.ucc.asn.au/dropbear/CHANGES
Local changes:
- Removed PKG_MULTI which is no longer in options.h (even before 2011.54)
- Merged DO_HOST_LOOKUP into 120-openwrt_options.patch
- Removed LD from make opts (now included in TARGET_CONFIGURE_OPTS)
- Removed 400-CVE-2012-0920.patch which is included in 2012.55
Signed-off-by: Catalin Patulea <cat@vv.carleton.ca>
Signed-off-by: Florian Fainelli <florian@openwrt.org>
SVN-Revision: 34496
