SMTP Injection via recipient email addresses in ruby-mail
Summary
DLA-489-1: ruby-mail - security update. Affects ruby-mail versions < 2.4.4-2+deb7u1. Fixed in 2.4.4-2+deb7u1. How to fix ↓
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Background
ruby-mail is a Ruby gem that provides a simple and efficient way to handle email messages. It is widely used in Ruby applications for sending and receiving emails. However, a security vulnerability has been discovered in the gem that allows for SMTP injection via recipient email addresses.
Vulnerability Detail
The vulnerability in ruby-mail arises from the lack of validation and sanitization of recipient email addresses. This allows an attacker to manipulate the recipient address and potentially inject malicious content into the email message. The vulnerability can be exploited by sending a long spam message via a recipient address, bypassing any length limits imposed by the application. It is important to note that this vulnerability only affects applications that lack proper input validation.
How To Fix
Minimum fixed version
2.4.4-2+deb7u1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade ruby-mailTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
There is no specific workaround mentioned for this vulnerability. However, as a general best practice, it is recommended to always validate and sanitize user input, including email addresses, to prevent potential security vulnerabilities.
Conclusion
The SMTP Injection vulnerability in ruby-mail can be mitigated by upgrading to version 2.4.4-2+deb7u1 or later. It is important to ensure that your application properly validates and sanitizes user input, including email addresses, to prevent potential security vulnerabilities. For further support on vulnerability remediation, you can reach out to DevNack.com.
See every vulnerability recorded for ruby-mail →
FAQ
The vulnerability affects versions of ruby-mail prior to 2.4.4-2+deb7u1.
You can check the version of ruby-mail installed on your system by running the command 'gem list ruby-mail' in your terminal.
No, only applications that lack proper input validation are vulnerable to this issue. It is important to ensure that your application validates and sanitizes user input, including email addresses.
No, the ruby-mail gem itself does not impose a length limit on email addresses. Any length limits would need to be implemented on the application's side.
You can find more information about this vulnerability in the whitepaper entitled 'SMTP Injection via recipient email addresses' by Takeshi Terada. The whitepaper discusses the vulnerability in detail and provides examples of potential attacks.
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