PT-2019-12016 · Claws Mail Team+2 · Claws Mail+2

Jens · Published 2017-03-27 · Updated 2021-07-21 · CVE-2019-10735

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions Claws Mail version 3.14.1

Description The issue allows an attacker with S/MIME or PGP encrypted emails to craft a multipart email, hiding the encrypted parts using HTML/CSS or ASCII newline characters. If the receiver replies to this email, they may unknowingly leak the plaintext of the encrypted message back to the attacker.

Recommendations For Claws Mail version 3.14.1, as a temporary workaround, consider disabling the reply function for emails with encrypted parts until a patch is available. Restrict access to sensitive emails and avoid using HTML/CSS or ASCII newline characters in emails to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Cleartext Transmission of Sensitive Information

Weakness Enumeration

CWE-319

Related Identifiers

ALT-PU-2017-1355

CVE-2019-10735

Affected Products

Alt Linux

Claws Mail

Debian

References · 8

• 🔥 https://thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=4159 · Exploit
• https://security-tracker.debian.org/tracker/CVE-2019-10735 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2019-10735 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-10735 · Security Note
• https://cve.org/CVERecord?id=CVE-2019-10735 · Security Note
• https://ubuntu.com/security/CVE-2019-10735 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-10735 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2019-10735 · Vendor Advisory