Zero-day Vulnerability Database

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Zero-day vulnerabilities discovered: 1

Remote code execution in FreeBSD
CVE-2011-4862

Buffer overflow

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to buffer overflow in the encrypt_keyid() function of telnetd. A remote attacker can send a very large encryption key to telnetd daemon, trigger buffer overflow and execute arbitrary code with root privileges.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

Software: FreeBSD

Links:

https://lists.freebsd.org/pipermail/freebsd-security/2011-December/006117.html
https://lists.freebsd.org/pipermail/freebsd-security/2011-December/006119.html
https://www.freebsd.org/security/advisories/FreeBSD-SA-11:08.telnetd.asc
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2011-008.txt
http://eromang.zataz.com/2012/01/16/cve-2011-4862-freebsd-telnet-buffer-overflow-metasploit-demo/
https://vulners.com/metasploit/MSF:AUXILIARY/SCANNER/TELNET/TELNET_ENCRYPT_OVERFLOW

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About zero-day vulnerabilities

Zero-day vulnerability is an undisclosed vulnerability in software that hackers can exploit to compromise computer programs, gain unauthorized access to sensitive data, penetrate networks, etc. We consider vulnerability a zero-day when there is no solution provided from software vendor and the vulnerability is being actively exploited by malicious actors.

Zero-day candidate is a potential zero-day vulnerability in software which might have been used in targeted attacks, however there is no evidence to support this suggestion.