SB2020010952 - Cross-site scripting in firefox (Alpine package)

Description

This security bulletin contains information about 1 vulnerability.

1) Cross-site scripting (CVE-ID: CVE-2019-17022)

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

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green

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 within the CSS sanitizer. When pasting a tag from the clipboard into a rich text editor, the CSS sanitizer does not escape < and > characters. If a webpage subsequently copies the node's innerHTML, assigning it to another innerHTML, this would result in an XSS vulnerability.

Remediation

Install update from vendor's website.

References

• https://git.alpinelinux.org/aports/commit/?id=af0d1d1edd77beb85efb9bbf0ad15000eb319170
• https://git.alpinelinux.org/aports/commit/?id=6b5e4482828c460437f6c79a23c688d6d99a14fd
• https://git.alpinelinux.org/aports/commit/?id=ed2c5b48f57ac3a3a379f6a0db7ef891fcdbaeeb