Security restrictions bypass in Mozilla Firefox - CVE-2017-7789

Vulnerability identifier: #VU7850

CSH Severity: Low

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2017-7789

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to insufficient same-origin policies. A remote attacker can trick the victim into visiting a specially crafted website, trigger the server to send two Strict-Transport-Security (STS) headers for a single connection and cause HTTP Strict Transport Security (HSTS) to fail to be enabled for the connection.

Mozilla Firefox
Arch Linux
Ubuntu

Update to version 55.0.

• https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/

• Multiple vulnerabilities in Mozilla Firefox
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