CVE-2013-1172 - Improper Input Validation

Severity

65%

Complexity

27%

Confidentiality

165%

The Cisco Security Service in Cisco AnyConnect Secure Mobility Client (aka AnyConnect VPN Client) does not properly verify files, which allows local users to gain privileges via unspecified vectors, aka Bug ID CSCud14153.

The Cisco Security Service in Cisco AnyConnect Secure Mobility Client (aka AnyConnect VPN Client) does not properly verify files, which allows local users to gain privileges via unspecified vectors, aka Bug ID CSCud14153.

CVSS 2.0 Base Score 6.6. CVSS Attack Vector: local. CVSS Attack Complexity: medium. CVSS Vector: (AV:L/AC:M/Au:S/C:C/I:C/A:C).

Demo Examples

Improper Input Validation

CWE-20

This example demonstrates a shopping interaction in which the user is free to specify the quantity of items to be purchased and a total is calculated.


               
...

The user has no control over the price variable, however the code does not prevent a negative value from being specified for quantity. If an attacker were to provide a negative value, then the user would have their account credited instead of debited.

Improper Input Validation

CWE-20

This example asks the user for a height and width of an m X n game board with a maximum dimension of 100 squares.


               
.../* board dimensions */
die("No integer passed: Die evil hacker!\n");
die("No integer passed: Die evil hacker!\n");
die("Value too large: Die evil hacker!\n");

While this code checks to make sure the user cannot specify large, positive integers and consume too much memory, it does not check for negative values supplied by the user. As a result, an attacker can perform a resource consumption (CWE-400) attack against this program by specifying two, large negative values that will not overflow, resulting in a very large memory allocation (CWE-789) and possibly a system crash. Alternatively, an attacker can provide very large negative values which will cause an integer overflow (CWE-190) and unexpected behavior will follow depending on how the values are treated in the remainder of the program.

Improper Input Validation

CWE-20

The following example shows a PHP application in which the programmer attempts to display a user's birthday and homepage.


               
echo "Birthday: $birthday<br>Homepage: <a href=$homepage>click here</a>"

The programmer intended for $birthday to be in a date format and $homepage to be a valid URL. However, since the values are derived from an HTTP request, if an attacker can trick a victim into clicking a crafted URL with <script> tags providing the values for birthday and / or homepage, then the script will run on the client's browser when the web server echoes the content. Notice that even if the programmer were to defend the $birthday variable by restricting input to integers and dashes, it would still be possible for an attacker to provide a string of the form:


               
2009-01-09--

If this data were used in a SQL statement, it would treat the remainder of the statement as a comment. The comment could disable other security-related logic in the statement. In this case, encoding combined with input validation would be a more useful protection mechanism.

Furthermore, an XSS (CWE-79) attack or SQL injection (CWE-89) are just a few of the potential consequences when input validation is not used. Depending on the context of the code, CRLF Injection (CWE-93), Argument Injection (CWE-88), or Command Injection (CWE-77) may also be possible.

Improper Input Validation

CWE-20

This function attempts to extract a pair of numbers from a user-supplied string.


               
}
die("Did not specify integer value. Die evil hacker!\n");
/* proceed assuming n and m are initialized correctly */

This code attempts to extract two integer values out of a formatted, user-supplied input. However, if an attacker were to provide an input of the form:


               
123:

then only the m variable will be initialized. Subsequent use of n may result in the use of an uninitialized variable (CWE-457).

Improper Input Validation

CWE-20

The following example takes a user-supplied value to allocate an array of objects and then operates on the array.


               
}
list[0] = new Widget();
die("Negative value supplied for list size, die evil hacker!");

This example attempts to build a list from a user-specified value, and even checks to ensure a non-negative value is supplied. If, however, a 0 value is provided, the code will build an array of size 0 and then try to store a new Widget in the first location, causing an exception to be thrown.

Improper Input Validation

CWE-20

This application has registered to handle a URL when sent an intent:


               
}......
}
}
int length = URL.length();
...

The application assumes the URL will always be included in the intent. When the URL is not present, the call to getStringExtra() will return null, thus causing a null pointer exception when length() is called.

Overview

First reported 11 years ago

2013-04-11 10:55:00

Last updated 11 years ago

2013-04-11 10:55:00

Affected Software

Cisco AnyConnect Secure Mobility Client

Cisco AnyConnect Secure Mobility Client 2.0

2.0

Cisco AnyConnect Secure Mobility Client 2.1

2.1

Cisco AnyConnect Secure Mobility Client 2.2

2.2

Cisco AnyConnect Secure Mobility Client 2.2.128

2.2.128

Cisco AnyConnect Secure Mobility Client 2.2.133

2.2.133

Cisco AnyConnect Secure Mobility Client 2.2.136

2.2.136

Cisco AnyConnect Secure Mobility Client 2.2.140

2.2.140

Cisco AnyConnect Secure Mobility Client 2.3

2.3

Cisco AnyConnect Secure Mobility Client 2.3.185

2.3.185

Cisco AnyConnect Secure Mobility Client 2.3.254

2.3.254

Cisco AnyConnect Secure Mobility Client 2.3.2016

2.3.2016

Cisco AnyConnect Secure Mobility Client 2.4

2.4

Cisco AnyConnect Secure Mobility Client 2.4 for Symbian OS

2.4
symbian_os

Cisco AnyConnect Secure Mobility Client 2.4.0202

2.4.0202

Cisco AnyConnect Secure Mobility Client 2.4.1012

2.4.1012

Cisco AnyConnect Secure Mobility Client 2.4.4004 for iPhone OS

2.4.4004
iphone_os

Cisco AnyConnect Secure Mobility Client 2.4.4014 for iPhone OS

2.4.4014
iphone_os

Cisco AnyConnect Secure Mobility Client 2.4.5004 for Symbian OS

2.4.5004
symbian_os

Cisco AnyConnect Secure Mobility Client 2.4.7030 for Android

2.4.7030
android

Cisco AnyConnect Secure Mobility Client 2.4.7073 for Android

2.4.7073
android

Cisco AnyConnect Secure Mobility Client 2.5

2.5

Cisco AnyConnect Secure Mobility Client 2.5.0217

2.5.0217

Cisco AnyConnect Secure Mobility Client 2.5.1025

2.5.1025

Cisco AnyConnect Secure Mobility Client 2.5.2001

2.5.2001

Cisco AnyConnect Secure Mobility Client 2.5.2006

2.5.2006

Cisco AnyConnect Secure Mobility Client 2.5.2010

2.5.2010

Cisco AnyConnect Secure Mobility Client 2.5.2011

2.5.2011

Cisco AnyConnect Secure Mobility Client 2.5.2014

2.5.2014

Cisco AnyConnect Secure Mobility Client 2.5.2017

2.5.2017

Cisco AnyConnect Secure Mobility Client 2.5.2018

2.5.2018

Cisco AnyConnect Secure Mobility Client 2.5.2019

2.5.2019

Cisco AnyConnect Secure Mobility Client 2.5.3041

2.5.3041

Cisco AnyConnect Secure Mobility Client 2.5.3046

2.5.3046

Cisco AnyConnect Secure Mobility Client 2.5.3051

2.5.3051

Cisco AnyConnect Secure Mobility Client 2.5.3054

2.5.3054

Cisco AnyConnect Secure Mobility Client 2.5.3055

2.5.3055

Cisco AnyConnect Secure Mobility Client 2.5.5112 for iPhone OS

2.5.5112
iphone_os

Cisco AnyConnect Secure Mobility Client 2.5.5116 for Android

2.5.5116
android

Cisco AnyConnect Secure Mobility Client 2.5.5118 for Android

2.5.5118
android

Cisco AnyConnect Secure Mobility Client 2.5.5125 for Android

2.5.5125
android

Cisco AnyConnect Secure Mobility Client 2.5.5130 for iPhone OS

2.5.5130
iphone_os

Cisco AnyConnect Secure Mobility Client 2.5.5131 for Android

2.5.5131
android

Cisco AnyConnect Secure Mobility Client 2.5.6005

2.5.6005

Cisco AnyConnect Secure Mobility Client 3.0

3.0

Cisco AnyConnect Secure Mobility Client 3.0 (x64) 64-bit

3.0

Cisco AnyConnect Secure Mobility Client 3.0.0629

3.0.0629

Cisco AnyConnect Secure Mobility Client 3.0.1047

3.0.1047

Cisco AnyConnect Secure Mobility Client 3.0.2052

3.0.2052

Cisco AnyConnect Secure Mobility Client 3.0.3050

3.0.3050

Cisco AnyConnect Secure Mobility Client 3.0.3054

3.0.3054

Cisco AnyConnect Secure Mobility Client 3.0.4235

3.0.4235

Cisco AnyConnect Secure Mobility Client 3.0.5075

3.0.5075

Cisco AnyConnect Secure Mobility Client 3.0.5080

3.0.5080

Cisco AnyConnect Secure Mobility Client 3.0.07059

3.0.07059

Cisco AnyConnect Secure Mobility Client 3.0.08057

3.0.08057

Cisco AnyConnect Secure Mobility Client 3.0.08057 (Maintenance Release 8 / MR8) (x64) 64-bit

3.0.08057

Cisco AnyConnect Secure Mobility Client 3.0.08066

3.0.08066

Cisco AnyConnect Secure Mobility Client 3.1.0

3.1.0

Cisco AnyConnect Secure Mobility Client 3.1.00495

3.1.00495

Cisco AnyConnect Secure Mobility Client 3.2.0

3.2.0

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