Privilege escalation in Mozilla Firefox - CVE-2017-7836

Vulnerability identifier: #VU9323

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2017-7836

CWE-ID: CWE-264

Exploitation vector: Local access

Exploit availability: No public exploit available

Vendor: Mozilla

Affected software:
Mozilla Firefox

The vulnerability allows a local user to escalate privileges on the system.

The "pingsender" executable used by the Firefox Health Report dynamically loads a system copy of libcurl, which an attacker could replace. This allows for privilege escalation as the replaced libcurl code will run with Firefox's privileges.
Note: This attack requires an attacker have local system access and only affects OS X and Linux. Windows systems are not affected.

Update to version Firefox 57.

• https://www.mozilla.org/en-US/security/advisories/mfsa2017-24/