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222
votes
13
answers
27k
views
Is there any reason to not show users incorrectly entered passwords after a successful login?
The website in question is a broad mapping/GIS application that does not feature any monetary transactions whatsoever. … What security vulnerabilities come with implementing such a feature? Our client is not entirely without technical knowledge so a general explanation is enough. …
203
votes
Accepted
Hosting company advised us to avoid PHP for security reasons. Are they right?
There are numerous such services available with varying feature sets, and they are popular for powering contact forms on statically generated sites. … If there were ever a security vulnerability in that process which did not depend on specific PHP code, it could be exploited. …
164
votes
How to explain Heartbleed without technical terms?
What is Heartbeat - the compromised TLS feature?
To set up a TLS connection there's a negotiation that's relatively expensive (it takes time). … For completeness, I should mention that this vulnerability should affect anything that may use the OpenSSL library to perform TLS, which isn't limited to webservers; e.g., FTPS servers (but not SFTP), …
125
votes
Accepted
Is there a short command to test if my server is secure against the shellshock bash bug?
Is my system vulnerable?
If your bash isn't vulnerable then your system isn't vulnerable. … The vulnerability is in a bash-specific feature and other shells such as dash and ksh are not affected. …
121
votes
12
answers
49k
views
How can I punish a hacker?
Since then, I have deleted the shells, fixed the vulnerability and blocked the IP address of the hacker.
Can I do something to punish the hacker since I have the IP address? …
121
votes
Meltdown and Spectre Attacks
Speculative execution is a feature of modern processors that comes as an optimisation. … Which platforms and which CPU are vulnerable?
Most of the Intel CPU are vulnerable to both attacks. AMD CPU seems to be only affected by Spectre. …
106
votes
5
answers
15k
views
Confirmed evidence of cyber-warfare using GPS history data
Hence the question: Is there any confirmed evidence of actual use of cyber-warfare exploiting the vulnerable GPS data? If so, what are they? …
101
votes
How dangerous is XSS?
Below are the things an attacker can do if there is XSS vulnerability. … Stealing HTML5 web storage data - HTML5 introduced a new feature, web
storage. …
85
votes
Accepted
Is it safe to allow www-data to execute privileged commands?
The whole point of running Web things as a non-root user is damage containment: in case the Web server process gets hijacked through some vulnerability, at least the attacker won't obtain full control … But if you give www-data a way to run every command it wishes to, with the rights of any user (including root), and without any further authentication, then you just lost that damage containment feature …
85
votes
Accepted
How does XSS work?
Using techniques like spam email, message board posts, IM messages, Social Engineering Toolkits this vulnerability can be very dangerous. … Take a look at RSnake Stallowned "attack" which took out Amazon's book preview feature. Quite funny reading. …
84
votes
6
answers
101k
views
Should RSA public exponent be only in {3, 5, 17, 257 or 65537} due to security considerations?
I contacted developers of this library and got the following reply: "This feature is to prevent some attacks on RSA keys. … I knew only of using 3 with improper padding being vulnerable.
Is that really so? Surely, I can use another library, but after such answer I worried about security of my solution. …
83
votes
Why do I hear about so many Java insecurities? Are other languages more secure?
It is somewhat speculative why exactly the Sandbox remains vulnerable. … As a result, it is quite possible for a developer to forget about that obscure feature when changing the Java API or its implementation, accidentally exposing things that should be protected (to illustrate …
80
votes
How does the log4shell vulnerability work?
In short - from my understanding the vulnerability is caused by:
treating data for logging as trusted, even though they might come from an untrusted source (like logging the user agent of a HTTP request … Unfortunately this feature was until log4j 2.15.0 enabled by default, even though logging often includes untrusted user input, e.g. logger.debug(userInput). …
80
votes
Accepted
How are all public computers (libraries, etc.) not full of malware?
Additionally, you have to assume that an attacker with physical access can find a local elevation-of-privilege vulnerability at some point. … This feature is generally available, through either built-in functionality or third-party software, for most operating systems. It's got weaknesses of its own, though. …
74
votes
Accepted
What can an attacker do with Bluetooth and how should it be mitigated?
In the normal case (no vulnerability to allow arbitrary code execution) it all depends on the Bluetooth profiles supported by your device. … (See below)
Assuming encryption is a security feature that can be enabled, is it
required or is it optional?
As in the previous question, it's implementation-dependeant. …