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Vigil@nce - Perl Email-Address: denial of service via nested comments

November 2015 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can send emails containing nested email address
comments, to a program using the Perl Email::Address module, in
order to trigger a denial of service.

 Impacted products: Perl Module not comprehensive.
 Severity: 2/4.
 Creation date: 28/09/2015.

DESCRIPTION OF THE VULNERABILITY

The Perl Email::Address module is used to analyze email addresses.

The chapter 3.2.3 of RFC 2822 allows nested comments. For example:
test@example.com (comment 1 (comment 2))

However, when Email::Address->parse() analyzes an email address
containing several nested comments, the CPU is overloaded.

An attacker can therefore send emails containing nested email
address comments, to a program using the Perl Email::Address
module, in order to trigger a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Perl-Email-Address-denial-of-service-via-nested-comments-17988


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