SB2020010602 - Multiple vulnerabilities in Postie plugin for WordPress

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Cross-site scripting (CVE-ID: CVE-2019-20204)

The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.

The vulnerability exists due to insufficient sanitization of user-supplied data. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.

Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.

PoC:

Use Polyglot JavaScript syntax with crafted SVG, as follows:

jaVasCript:/*--></title></style></textarea></script></xmp><svg/onload='+/"/+/onmouseover=1/+/[*/[]/+alert(1)//'>

2) Spoofing attack (CVE-ID: CVE-2019-20203)

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data in the Authorized Addresses feature. A remote attacker can spoof the From information of an email message and publish a post as a valid user.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://github.com/V1n1v131r4/Exploiting-Postie-WordPress-Plugin-/blob/master/README.md
• https://postieplugin.com/
• https://wordpress.org/plugins/postie/#developers
• https://wpvulndb.com/vulnerabilities/10002