от FreeJak(2-08-2002)
ВИжте пълния текст на http://www.openssh.com/txt/trojan.adv:
OpenSSH Security Advisory (adv.trojan)
1. Systems affected:
OpenSSH version 3.2.2p1, 3.4p1 and 3.4 have been trojaned on
the
OpenBSD ftp server and potentially propagated via the normal
mirroring
process to other ftp servers. The code was inserted
some time between
the 30th and 31th of July. We replaced the trojaned
files with their
originals at 7AM MDT, August 1st.
2. Impact:
Anyone who has installed OpenSSH from the OpenBSD ftp server
or any
mirror within that time frame should consider his system
compromised.
The trojan allows the attacker to gain control of the system
as the
user compiling the binary. Arbitrary commands can be
executed.
3. Solution:
Verify that you did not build a trojaned version of the
sources. The
portable SSH tar balls contain PGP signatures that should be
verified
before installation. You can also use the following
MD5 checksums for
verification.
MD5 (openssh-3.4p1.tar.gz) =
459c1d0262e939d6432f193c7a4ba8a8
MD5 (openssh-3.4p1.tar.gz.sig) =
d5a956263287e7fd261528bb1962f24c
MD5 (openssh-3.4.tgz) = 39659226ff5b0d16d0290b21f67c46f2
MD5 (openssh-3.2.2p1.tar.gz) =
9d3e1e31e8d6cdbfa3036cb183aa4a01
MD5 (openssh-3.2.2p1.tar.gz.sig) =
be4f9ed8da1735efd770dc8fa2bb808a
4. Details
When building the OpenSSH binaries, the trojan resides in
bf-test.c
and causes code to execute which connects to a specified IP
address.
The destination port is normally used by the IRC protocol.
A
connection attempt is made once an hour. If the
connection is
successful, arbitrary commands may be executed.
Three commands are understood by the backdoor:
Command A: Kill the exploit.
Command D: Execute a command.
Command M: Go to sleep.
5. Notice:
Because of the urgency of this issue, the advisory may not
be
complete. Updates will be posted to the OpenSSH web
pages if
necessary.
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