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STEP 2 : Skipping, magic number already exists: [87,01:03,02:01,01:02,04] STEP 3 : Checking if we can reach our return address by format string STEP 4 : Ptr address test: 0xbfffb028 (if it is not 0xbfffb028 ^C me now) STEP 5 : Sending code this will take about 10 seconds Press ^\ to leave shell Linux shadow 2214-50 #1 Tue Mar 7 21:07:39 EST 2000 i686 unknown uid=0(root) gid=0(root) egid=50(ftp) groups=50(ftp)
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U FTP Countermeasure allowing anonymous FTP access can be hazardous to your Although FTP is very useful,
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As demonstrated earlier, this attack is extremely deadly Anonymous access to a vulnerable FTP server that supports site exec is enough to gain root access Other security flaws with BSD-derived ftpd versions dating back to 1993 can be found at http://wwwcertorg/advisories/CA-2000-13html These vulnerabilities are not discussed in detail here, but are just as deadly
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server s health Evaluate the need to run an FTP server and certainly decide if anonymous FTP access is allowed Many sites must allow anonymous access via FTP; however, give special consideration to ensuring the security of the server It is critical that you make sure the latest vendor patches are applied to the server, and you eliminate or reduce the number of world-writable directories in use
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Where to start Sendmail is a mail transfer agent (MTA) that is used on many UNIX systems Sendmail is one of the most maligned programs in use It is extensible, highly configurable, and definitely complex In fact, sendmail s woes started as far back as 1988 and were used to gain access to thousands of systems The running joke at one time was what is the sendmail bug of the week Sendmail and its related security have improved vastly over the past few years, but it is still a massive program with over 80,000 lines of code Thus, the odds of finding additional security vulnerabilities are still good Recall from 3, sendmail can be used to identify user accounts via the vrfy and expn commands User enumeration is dangerous enough, but doesn t expose the true danger that you face when running sendmail There have been scores of sendmail security vulnerabilities discovered over the last ten years, and there are more to come Many vulnerabilities related to remote buffer overflow conditions and input validation attacks have been identified One of the most popular sendmail attacks was the sendmail pipe vulnerability that was present in sendmail 41 This vulnerability al-
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lowed attackers to pipe commands directly to sendmail for execution Any command after the data would be executed by sendmail with the privileges of bin:
helo mail rcpt data mail rcpt data from: | to: bounce
from: bin to: | sed '1,/^$/d' | sh
Aside from the common buffer overflow and input validation attacks, it is quite possible to exploit sendmail s functionality to gain privileged access A common attack is to create or modify a user s ~/forward via FTP or NFS, assuming the attackers have write privileges to the victim s home directory A ~/forward file typically forwards mail to a different account or runs some program when mail arrives Obviously, attackers can modify the ~/forward file for nefarious purposes Let s take a look at an example of what attackers might add to a ~/forward file on the victim s system:
[tsunami]$ cat > forward |"cp /bin/sh /home/gk/evil_shell ; chmod 755 /home/gk/evil_shell" <crtl> D [tsunami]$ cat forward |"cp /bin/sh /home/gk/evil_shell ; chmod 755 /home/gk/evil_shell"
After this file is created, attackers will move the evil ~/forward file to the target system, assuming that a user s home directory is writable Next, the attackers will send mail to the victim account:
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