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SonicWALL SSL-VPN Appliance Format String Vulnerability
aushack.com - Vulnerability Advisory
SonicWALL - SSL-VPN Remote Access
"SonicWALL SSL VPN appliances provide small and mid-size organizations an
easy-to-use, secure and affordable remote access solution that requires no
pre-installed client software. Utilizing a standard Web browser, authorized
users such as employees, contractors, partners and customers, can easily and
securely access e-mail, files, intranets, Web and legacy applications
and remote desktops from any location."
SonicWALL SSL-VPN 2000/4000 18.104.22.168 and below.
SonicWALL SSL-VPN 200 22.214.171.124 and below.
Format string vulnerability.
High - Remote code execution, and the ability to remotely map out the
internal memory structures.
This vulnerability allows remote attackers to execute format string specifiers
on the remote appliance as an unauthenticated user.
The device uses a HTML form, where failed authentication results in an error:
"Login failed - Incorrect name/password"
By inserting format strings instead of expected input, the statement
by printf() and the result is returned in a HTTP GET response.
The following GET request will result in "ABCD0044434241" being returned.
0x44434241 is the little endian hexadecimal representation for ABCD.
It is possible to read memory remotely by specifying further format
strings, such as:
This may reveal sensitive information.
Attempts to write to memory result in an error, indicating that an
may have occurred, therefore remote code execution is likely possible
with further research (i.e. physical access :).
"Sorry, the SSL-VPN you are trying to reach is unavailable at this
time. Please try again later."
Patrick Webster ( patrick@xxxxxxxxxxx )
12-Jan-2009 - Discovered during audit.
09-Feb-2009 - 1st email sent to security@xxxxxxxxxxxxxx No response.
27-Feb-2009 - 2nd email sent to security@xxxxxxxxxxxxxx No response.
01-May-2009 - Asked contacts within the security industry for
07-May-2009 - Received email from SonicWALL contact.
08-May-2009 - Sent details to SonicWALL contact.
15-May-2009 - SSL 200 - 126.96.36.199 fix released.
27-May-2009 - SSL 2000/4000 - 188.8.131.52 fix released.
29-May-2009 - Public disclosure.