Attacks and vulnerabilities

To view all vulnerabilities, please see the Vulnerability Category page. This attack occurs when XML input containing a reference to an external entity is processed by a weakly configured XML parser. This attack may lead to the disclosure of confidential data, denial of service, server side request forgery, port scanning from the perspective of the machine where the parser is located, and other system impacts.

Attacks and vulnerabilities

Both technologies add an additional layer of security to your email communication. If used properly, both technologies should guarantee confidentiality and authenticity of your email messages even if an attacker has full access to your email account.

Journalists, political activists or whistleblowers use an additional encryption layer, often PGP, because they fear that someone gets access to their email communication. This leads to the situation where anyone getting access to their email communication can also read the victims emails even if they use additional PGP encryption.

Can you read my emails? You are thus only affected if an attacker already has access to your emails. But my emails are TLS encrypted!

TLS is a transport layer encryption technology that encrypts network traffic among email clients and email servers, or between two email servers. However, the emails are processed and stored in plaintext on the servers and in the email accounts.

Any attacker getting access to these emails, either via compromising an email account or an email server, can read and change these emails. Is my email client affected? Can I find out whether I have already been attacked?

A strong indication for these attacks could be, for example, malformed emails with unclosed img tags followed by encrypted content, or encrypted content that exfiltrates the plaintext to foreign URLs.

Zero-day (computing) - Wikipedia

However, note that emails are encrypted with the keys of sender as well as all receivers. The attacker can target any of these parties to exfiltrate content that is important to you.

Attacks and vulnerabilities

In advanced attack scenarios where the attacker is in control of the email server, she could have deleted the malicious emails after the victim has processed them. I don't send HTML emails.

I have disabled HTML in my email client. Am I safe now? Will signatures prevent these attacks? Even if signatures did matter: Can you decrypt my own encrypted emails when I lost my private key?

The EFAIL attacks target a victim, who is in possession of the private key and who decrypts our prepared emails in an email client. Do I need to revoke my certificate or public key?

She does not get direct access to the private key. There may be edge cases though that we hadn't looked into.

XML External Entity (XXE) Processing - OWASP

For example, if you encrypted a directory with sensitive files, an attacker could change these encrypted files to contain false information or even malware. If a victim decrypts the directory and opens any of the files, malware or even just an HTML file could be used to exfiltrate plaintext or even compromise the system.

What happens if there are quotes in the encrypted email? Quotes in the plaintext might end the URL that is used to exfiltrate the plaintext so that either the bytes after the quote are not exfiltrated or that the exploit may not work at all.This is what a successful digital transformation looks like, based on research into the characteristics of enterprises that have succeeded with transformations in real life.

Understanding risk, threat, and vulnerability.

Attacks and vulnerabilities

and "vulnerability" will be defined and differentiated here: Risk. The term "risk" refers to the likelihood of being targeted by a given attack. This Alert provides information on the 30 most commonly exploited vulnerabilities used in these attacks, along with prevention and mitigation recommendations.

Mar 27,  · ABroken Authentication. Application functions related to authentication and session management are often implemented incorrectly, allowing attackers to compromise passwords, keys, or session tokens, or to exploit other implementation flaws to assume other users' identities temporarily or permanently.

Symantec helps consumers and organizations secure and manage their information-driven world. Our software and services protect against more risks at more points, more completely and efficiently, enabling confidence wherever information is used or stored.

The Symantec Connect community allows customers and users of Symantec to network and learn more about creative and innovative ways to use. Cross Site Scripting vulnerabilities are the most common vulnerability found in WordPress plugins by a significant margin. In an analysis that we did of WordPress plugin vulnerabilities reported over a 14 month period, we found the following distribution.

Top Top 10 - OWASP