A software vulnerability is a defect in software that could allow an attacker to gain control of a system. These defects can be because of the way the software is designed, or because of a flaw in the way that it’s coded.
An
attacker first finds out if a system has a software vulnerability by scanning
it. The scan can tell the attacker what types of software are on the
system, are they up to date, and whether any of the software packages are
vulnerable. When the attacker finds that out, he or she will have a
better idea of what types of attacks to launch against the system. A
successful attack would result in the attacker being able to run malicious
commands on the target system.
An
attacker can exploit a software vulnerability to steal or manipulate sensitive
data, join a system to a botnet, install a backdoor, or plant other types of
malware. Also, after penetrating into one network host, the attacker
could use that host to break into other hosts on the same network.
I.
Causes a Software Vulnerability
There are two main things that can cause a software
vulnerability.
i. A flaw in the program’s design, such as in the login function, could introduce a vulnerability.
ii. Even if the design is perfect, there
could still be a vulnerability if there’s a mistake in the program source code.
Coding errors could introduce several types of
vulnerabilities, which include the following:
Buffer
overflows – These allow someone to put more data into an
input field than what the field is supposed to allow. An attacker can
take advantage of this by placing malicious commands into the overflow portion
of the data field, which would then execute.
SQL
Injection – This could allow an attacker to inject malicious
commands into the database of a web application. The attacker can do this
by entering specially-crafted Structured Query Language commands into either a
data field of a web application form, or into the URL of the web application.
If the attack is successful, the unauthorized and unauthenticated
attacker would be able to retrieve or manipulate data from the database.
Third-party
libraries – Many programmers use third-party code libraries,
rather than try to write all software from scratch. This can be a real
time-saver, but it can also be dangerous if the library has any
vulnerabilities. Before using any of these libraries, developers need to
verify that they don’t have vulnerabilities.
Application
Programming Interfaces – An API, which allows
software programs to communicate with each other, could also introduce a
software vulnerability. Many APIs are not set up with strict security
policies, which could allow an unauthenticated attacker to gain entry into a
system.
Prevention:
The best way to deal with a software vulnerability
is to prevent it from happening in the first place. Software developers
need to learn secure coding practices, and automatic security testing must be
built into the entire software development process.
Software developers are responsible to continually
monitor for publications of new vulnerabilities that affect software they sold.
Once such a vulnerability is discovered they must patch it as quickly as
possible and send an update to the users.
End users have the responsibility of keeping their
systems up-to-date, especially with installing security-related software
patches.
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