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Questions tagged [vulnerability]

A weakness or flaw in computer software and hardware which allows an attacker to take advantage of (exploit) a targeted system.

238
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4answers
108k views

SSL3 “POODLE” Vulnerability

Canonical question regarding the recently disclosed padding oracle vulnerability in SSL v3. Other identical or significantly similar questions should be closed as a duplicate of this one. What is the ...
166
votes
3answers
15k views

Meltdown and Spectre Attacks

Canonical question regarding the 2018 Jan. disclosed Meltdown and Spectre Attacks. Other identical or significantly similar questions should be closed as a duplicate of this one. Main concerns What ...
123
votes
8answers
18k views

Are there technical differences which make Linux less vulnerable to virus than Windows?

What makes Linux so different than Windows in terms of anti-virus needs? My question is not if I should get an anti-virus for my Linux. I perfectly understand why an AV is important. I would like ...
122
votes
2answers
17k views

How is the Heartbleed exploit even possible?

I have read about the Heartbleed OpenSSL vulnerability and understand the concept. However what I don't understand is the part where we pass 64k as the length and the server returns 64kb of random ...
105
votes
15answers
20k views

How can I argue against: “System is unhackable so why patch vulnerabilities?”

An operating system has reached End of Support (EoS) so no more security patches are coming for the OS ever. An embedded device running this OS needs to be updated to a newer version. However, the ...
91
votes
9answers
12k views

Is it a security vulnerability if the addresses of university students are exposed?

I am sorry for my lack of knowledge in this matter. My university (basically an international university in the UK that has students from different countries) has a website which requires the ...
80
votes
8answers
19k views

How is 'Removing RAM' a security risk?

Today I was watching a video on 'Ethical Hacking' where, while discussing hardware attacks, the narrator said: Removing RAM or components from a desktop or a laptop Here's a screenshot: I ...
70
votes
3answers
28k views

CVE-2018-10933 - Bypass SSH Authentication - libssh vulnerability

Looks like CVE-2018-10933 was just released today and you can find a summary here from libssh here Summary: libssh versions 0.6 and above have an authentication bypass vulnerability in the server ...
63
votes
2answers
11k views

Does removing a GUI from a server make it less vulnerable?

Lately, I was watching an online video about Microsoft Certified Solutions Associate (MCSA) and in one of the videos it says "removing GUI from Windows server makes it less vulnerable." Is that true? ...
63
votes
1answer
6k views

Who “brands” vulnerabilities?

It appears that every time there's a vulnerability discovered major enough to hit the news, its been assigned a brand name and often even a logo. Heartbleed, Spectre, Meltdown, Foreshadow, etc. Who ...
63
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3answers
5k views

Are staggered roll outs of security patches bad?

Many Android devices, including the Google Nexus line, are now receiving monthly security patches via OTA updates, accompanied by the Android Security Bulletins. However, these updates are often ...
53
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3answers
19k views

What kind of attack is prevented by Apache2's error code AH02032 (“Hostname provided via SNI and hostname provided via HTTP are different”)?

I saw in my Apache2 server logs messages like [ssl:error] [pid 28482] AH02032: Hostname xxx.yyy.zzz.www:443 provided via SNI and hostname xxx.yyy.zzz.www provided via HTTP are different One of ...
50
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6answers
24k views

What can hackers do with ability to read /etc/passwd?

On the exploit websites I see security analysts and hackers targeting the /etc/passwd file when showing the proof of concept. If you have a local file inclusion or path traversal vulnerability on ...
48
votes
2answers
7k views

What is happening now with the Grub backspace key security vulnerability?

I just read a few articles about a new Grub vulnerability. The article said that you can bypass the password protection by pressing backspace twenty eight times. I am a security guy and I am ...
48
votes
6answers
7k views

Should I be concerned if my website throws stack information?

I have a simple login form on my web page and the URL looks like this: example.com/signup/signup.php?q=1 If I try something like this: example.com/signup/signup.php?q=1&() I'm redirected to a ...
44
votes
5answers
22k views

Can malicious code trigger without the user executing or opening the file?

If a file is downloaded from the Internet, and saved on disk, but is not opened by a user (if we keep autorun off), are there any chances that malicious code (e.g. a virus) in the file could trigger? ...
41
votes
3answers
23k views

Are ordinary OS X desktops at risk from bash “shellshock” bug (CVE-2014-6271)?

I've recently heard via Twitter about CVE-2014-6271. Are ordinary OS X desktops, that aren't acting as a web server, at risks of receiving attacks that could exploit this vulnerability?
35
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6answers
10k views

On Windows boxes, is patching for Spectre and Meltdown necessary?

From what I've read, Spectre and Meltdown each require rogue code to be running on a Windows box in order for attacks to take place. The thing is, once a box has rogue code running, it's already ...
35
votes
1answer
4k views

How does a nonce reset allow for decryption?

I'm sure that by now most InfoSec-lovers have heard about KRACK. If you haven't, check out this great explaination by a fellow StackExchanger. It's a new attack on WPA2 which allows for decryption ...
32
votes
2answers
5k views

HTML login form without a CSRF protection

We've recently got a vulnerability report saying that one of our HTML forms in one of the internal applications is not CSRF protected. At first, we could not immediately reproduce it manually using ...
29
votes
2answers
3k views

Is the undesirable conversion of a scientific number a vulnerability?

I noticed in several penetration tests that PHP is converting values like 1e9 to 1000000000 while the max accepted string length of this number is 3 (in the database storage and as maxlength property ...
28
votes
1answer
3k views

How does CVE-2014-9390 affect me?

On 18th December, a vulnerability in git and mecurial was announced.  What are the details of the vulnerability?  Does it affect me?  What should I do?
26
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7answers
5k views

Is the unauthorized deletion of data considered a breach of integrity or availability?

I am in the process of writing a security vulnerabilities report on an application used at my employer, having completed an application audit. One discovered vulnerability can lead to unauthorized ...
26
votes
4answers
4k views

What to do when I find a possible security vulnerability of public interest? [duplicate]

Let's say I found a possible vulnerability in a security system. The system has been universally considered sound for years and nowadays is used worldwide. I am not an expert in security, but there ...
25
votes
3answers
6k views

Is it safe to allow www-data to execute privileged commands?

I have noticed several questions on Stack Overflow, like this one, about executing commands with root privileges using PHP. The answer proposed to add the line www-data ALL=(ALL) NOPASSWD: ALL to ...
24
votes
1answer
4k views

What's the security issue with base64 encoding/decoding?

http://phptester.net/ yields the warning WARNING base64_decode() has been disabled for security reasons Why? Besides the obvious vulnerabilities that have nothing to do with base64_decode (...
23
votes
4answers
2k views

Cloudbleed: is it actually important to change ALL passwords?

In response to Google and Cloudflare's recent disclosures of the Cloudbleed vulnerability, some sources like TNW are recommending that people change passwords for sites and services that use ...
19
votes
2answers
1k views

What was behind the surge of Adobe Flash Player vulnerabilities/patches in 2015?

It's no secret that 2015 was a rough year, security-wise, for Adobe's Flash Player. Aside from Adobe itself beginning to essentially deprecate Flash development largely due to Flash Player's ...
18
votes
1answer
36k views

What are the main vulnerabilities of TLS v1.1?

What are the main vulnerabilities of TLS v1.1? Actually, no RFC describes v1.1 vulnerabilities, neither what pushed them to change to the new protocol 1.2 except the description given in section 1.2 ...
14
votes
2answers
4k views

What are the privacy and security risks associated with Intel's Management Engine and AMD's Platform Security Processor?

And also as an everyday user who mostly just surfs the web, are these risks a huge concern for me? Edit: Also on the similar note, are there any substantial evidences of Intel or AMD purposely ...
14
votes
1answer
287 views

Why is caller ID spoofing so simple, and catching offenders so hard?

There is plenty of software which allows a user to input a recipient's information, and a fake-originator's information, and the software will complete the caller ID spoof. I'm trying to understand ...
13
votes
6answers
8k views

What pages are vulnerable to SQL injection?

I believe I understand the basics of SQL injection. I also know using prepared statements with PHP files is the best way to prevent SQL injection. I was always told that SQL injection happens most ...
13
votes
1answer
4k views

New CVE-2018-5407 “PortSmash vulnerablity” in Intel CPU

I just heard in the news: Intel CPUs impacted by new PortSmash side-channel vulnerability. Is it as threatening as Meltdown/Spectre? Is it patched? What should we do to be safe? Does it affect AMD CPU'...
13
votes
2answers
674 views

How to detect Rowhammer vulnerability?

Related to How to know whether a RAM module is vulnerable to rowhammer before buying?, how can I check whether my already installed memory modules are susceptible to this attack, without having to use ...
13
votes
1answer
6k views

What is WebRTC and how can I protect myself against leaking information that doesn't need to be shared?

What is WebRTC and what is it intended to be used for? According to this Browser Leaks Test for WebRTC and IP Leaks, I am currently leaking IP information for IP addresses that I do not believe ...
12
votes
4answers
2k views

Is it possible for a vulnerability in one application to be exploited to attack another application on the same server?

If for example I have Magento-eCommerce and WordPress installed on the same server. Both have a database each with a different database username/password and both have different login details to the ...
12
votes
3answers
752 views

Are virtualized environments vulnerable to the Row Hammer attack?

Row Hammer is an exploit which relies on RAM defects to get unrestricted access to the RAM content, allowing to read/write otherwise protected memory and to get higher privileges on the system. To ...
11
votes
3answers
11k views

What is a good XSS vector without forward slashes and spaces?

I need an XSS vector that doesn't use forward slashes nor spaces. I've gone through lists of hundreds of vectors, but they usually have one of those two. The space gets URL encoded, and anything after ...
11
votes
3answers
633 views

How can malware immediately infect a Windows XP computer as soon as it goes online without any user action?

This is a thing I used to hear back in the olden days of Windows XP... People were telling me that a computer running on an out-of-date Windows XP system with no antivirus software was getting ...
11
votes
2answers
962 views

How to handle media files from untrusted sources?

I've been a heavy user of ffmpeg-based players and encoders for years, and though I've heard about numerous security issues, I always assumed that staying up-to-date was safe enough. However, I just ...
11
votes
3answers
3k views

How to minimize the risk posed by Intel AMT/ME's “ring -3 exploits”?

This question is about how to minimize the risk posed by Intel AMT/ME's ring -3 exploits? I'm looking for advice on common strategies and practices. Here is my current situation. I am parking my ...
10
votes
2answers
1k views

Why Can't Google Just Switch to Pushing Android Security Updates Directly to Users?

Okay, I'll just begin with the question and then elaborate a bit below. It is: Why has the world's dominant maker of non-Apple smartphone operating systems, Google, still not adopted a straight-to-...
10
votes
3answers
6k views

SQL Injection if table structure/db structure not known

could an attacker who'd just found out that you're using mysql make an SQL Injection attack with only this information? If you don't know Any table/db name how come you can find it out? Is that even ...
10
votes
2answers
1k views

How does the DYLD privilege escalation vulnerability work on OS X?

Just reading about the DYLD privilege escalation vulnerability reported by Stefan Esser at https://www.sektioneins.de/en/blog/15-07-07-dyld_print_to_file_lpe.html I understand this allows anyone to ...
10
votes
1answer
3k views

Is Java vulnerable to glibc GHOST Vulnerability in Linux?

I see on our RedHat Linux platform that "java" process has dependency over glibc library: [root@hpproliant1 ~]# ldd /usr/bin/java linux-gate.so.1 => (0xffffe000) libpthread.so.0 => /lib/...
9
votes
5answers
2k views

Can we trust the information displayed by the linux utility commands for a vulnerable machine?

After checking a vulnerable linux machine for rootkit and deleting them, we need to get some informations about the process , port ,incoming or outgoing connections... , using some useful commands as ...
9
votes
3answers
970 views

Downloaded file checksums

More than often next to the download button of a file there is a variety of checksums. When I download a file what security risks am I exposed to if I don't check for its integrity?
9
votes
4answers
4k views

What do shellshock attacks look like in system logs? [closed]

I have some Linux servers, which from what I can tell are not vulnerable to the shellshock attack vector, but I am curious what the attack looks like in the logs. What does a successful attack look ...
9
votes
1answer
521 views

New TLS encryption-busting attack also impacts the newer TLS 1.3, is ECDHE_RSA also affected?

February 9, 2019: Source: New TLS encryption-busting attack also impacts the newer TLS 1.3 "Seven researchers from all over the world found --yet again-- another way to break RSA PKCS#1 v1.5, the ...
9
votes
4answers
1k views

How should I escalate a vulnerability that is dismissed by the vendor?

I've come across a vulnerability that secure@microsoft does not think is worth pursuing. I would estimate that there are many, many customers affected by this issue. I do not want to start a ...