PT-2020-10610 · Proofpoint · Proofpoint Email Protection

Nick Landers + 1 · Published 2020-03-30 · Updated 2024-08-19 · CVE-2019-20634

Positive Technologies (AI Summary)

CVSS v2.0

4.3

Medium

Base vector

AV:N/AC:M/Au:N/C:P/I:N/A:N

Name of the Vulnerable Software and Affected Versions Proofpoint Email Protection versions prior to 2019-09-08

Description An issue was discovered in Proofpoint Email Protection. By collecting scores from Proofpoint email headers, it is possible to build a copy-cat Machine Learning Classification model and extract insights from this model. The insights gathered allow an attacker to craft emails that receive preferable scores, with a goal of delivering malicious emails.

Recommendations For versions prior to 2019-09-08, consider implementing additional email filtering rules to detect and block malicious emails that may have been crafted using the insights gathered from the Proofpoint email headers. As a temporary workaround, consider enhancing the email scoring system to make it more difficult for attackers to build a copy-cat Machine Learning Classification model.

Fix

Weakness Enumeration

CWE-697

Related Identifiers

CVE-2019-20634

Affected Products

Proofpoint Email Protection

References · 10

• https://osv.dev/vulnerability/CVE-2019-20634 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2019-20634 · Security Note
• https://proofpoint.com/us/security/CVE-2019-20634 · Vendor Advisory
• https://proofpoint.com/us/security/security-advisories/pfpt-sn-2020-0001 · Vendor Advisory
• https://github.com/moohax/Proof-Pudding · Note
• https://github.com/moohax/Talks/blob/master/slides/DerbyCon19.pdf · Note
• https://t.me/cvenotify/91167 · Telegram Post
• https://t.me/cvenotify/2263 · Telegram Post
• https://t.me/cibsecurity/10850 · Telegram Post
• https://atlas.mitre.org/studies/AML.CS0008 · Note