Spectre side-channel attack in Mozilla Firefox



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID N/A
CWE-ID CWE-385
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Mozilla Firefox
Client/Desktop applications / Web browsers

Firefox ESR
Client/Desktop applications / Web browsers

Vendor Mozilla

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Spectre side-channel attack

EUVDB-ID: #VU9870

Risk: Medium

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

CVE-ID: N/A

CWE-ID: CWE-385 - Covert Timing Channel

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to an error in Intel processor microcode, which can lead to timing side-channel attack and data extraction from modern CPUs.

The vulnerability is dubbed "Spectre". The PoC-code was created in JavaScript, which demonstrated possibility of the attack.

Mitigation

Update to version 57.0.4.

Vulnerable software versions

Mozilla Firefox: 40.0 - 57.0.3

Firefox ESR: 45.0 - 45.8

CPE2.3 External links

https://www.mozilla.org/en-US/security/advisories/mfsa2018-01/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

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.



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