Quantum Secular Labs / Blog / Advisories
CVE-2018-12387: Mozilla Firefox: Information disclosure
CVE-2018-12387 is rated critical with a CVSS v3.0 base score of 9.1 and affects Mozilla Firefox, along with 8 other products in NVD’s configuration data. Per its scoring, it can be exploited over the network, without authentication, without any user interaction.
Vulnerability description
A vulnerability where the JavaScript JIT compiler inlines Array.prototype.push with multiple arguments that results in the stack pointer being off by 8 bytes after a bailout. This leaks a memory address to the calling function which can be used as part of an exploit inside the sandboxed content process. This vulnerability affects Firefox ESR < 60.2.2 and Firefox < 62.0.3.
Severity breakdown
CVSS v3.0 9.1: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
- Attack complexity: Low. No special conditions; the attack can be repeated reliably.
- Privileges required: None. No account or prior access is needed.
- User interaction: None. No action from any user is needed.
- Scope: Unchanged. Impact stays within the vulnerable component.
- Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
- Integrity impact: None. No loss of integrity.
- Availability impact: High. Total loss of availability; the component can be shut down.
Underlying weakness
CWE-20: Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Affected products
- Mozilla Firefox: before 60.2.2; before 62.0.3
- Red Hat Enterprise Linux Desktop: 6.0; 7.0
- Red Hat Enterprise Linux Server: 6.0; 7.0
- Red Hat Enterprise Linux Server Aus: 7.6
- Red Hat Enterprise Linux Server Eus: 7.5; 7.6
- Red Hat Enterprise Linux Server Tus: 7.6
- Red Hat Enterprise Linux Workstation: 6.0; 7.0
- Debian Linux: 9.0
- Canonical Ubuntu Linux: 14.04; 16.04; 18.04
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1493903
- https://www.mozilla.org/security/advisories/mfsa2018-24/
- http://www.securityfocus.com/bid/105460
- http://www.securitytracker.com/id/1041770
- https://access.redhat.com/errata/RHSA-2018:2881
- https://access.redhat.com/errata/RHSA-2018:2884
- https://security.gentoo.org/glsa/201810-01
- https://usn.ubuntu.com/3778-1/
- https://www.debian.org/security/2018/dsa-4310