Stored cross-site scripting in Postbird

1) Stored cross-site scripting

EUVDB-ID: #VU53671

Risk: Low

CVSSv4.0: 2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P/U:Clear]

CVE-ID: CVE-2021-33570

CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Exploit availability: Yes

Description

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 in the onerror attribute of an IMG element in any PostgreSQL database table. A remote authenticated attacker can inject 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.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Postbird: 0.1 - 0.8.4

CPE2.3

• cpe:2.3:a:Paxa:postbird:0.1:*:*:*:*:*:*:*
• cpe:2.3:a:Paxa:postbird:0.2:*:*:*:*:*:*:*
• cpe:2.3:a:Paxa:postbird:0.2.0:*:*:*:*:*:*:*

External links

https://github.com/Tridentsec-io/postbird
https://github.com/Paxa/postbird/issues/134
https://github.com/Paxa/postbird/issues/132
https://github.com/Paxa/postbird/issues/133
https://packetstormsecurity.com/files/162831/Postbird-0.8.4-Cross-Site-Scripting-Local-File-Inclusion.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.