SB2019040702 - Input validation error in Roundcube

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Input validation error (CVE-ID: CVE-2019-10740)

The vulnerability allows a remote non-authenticated attacker to manipulate data.

In Roundcube Webmail before 1.3.10, an attacker in possession of S/MIME or PGP encrypted emails can wrap them as sub-parts within a crafted multipart email. The encrypted part(s) can further be hidden using HTML/CSS or ASCII newline characters. This modified multipart email can be re-sent by the attacker to the intended receiver. If the receiver replies to this (benign looking) email, they unknowingly leak the plaintext of the encrypted message part(s) back to the attacker.

2) Input validation error (CVE-ID: CVE-2019-15237)

The vulnerability allows a remote attacker to perform a spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input when handling Punycode xn-- domain names. A remote attacker can perform a spoofing attack and disguise the email sender. 

Remediation

Install update from vendor's website.

References

• https://github.com/roundcube/roundcubemail/issues/6638
• https://github.com/roundcube/roundcubemail/releases/tag/1.3.10
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TFFMSO5WKEYSGMTZPZFF4ZADUJ57PRN5/
• https://github.com/roundcube/roundcubemail/issues/6891