CVE-2017-7781

MEDIUM

Description

An error occurs in the elliptic curve point addition algorithm that uses mixed Jacobian-affine coordinates where it can yield a result "POINT_AT_INFINITY" when it should not. A man-in-the-middle attacker could use this to interfere with a connection, resulting in an attacked party computing an incorrect shared secret. This vulnerability affects Firefox < 55.

References

http://www.securityfocus.com/bid/100383

http://www.securitytracker.com/id/1039124

https://bugzilla.mozilla.org/show_bug.cgi?id=1352039

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

Details

Source: MITRE

Published: 2018-06-11

Updated: 2019-10-03

Risk Information

CVSS v2.0

Base Score: 4.3

Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N

Impact Score: 2.9

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3.0

Base Score: 5.9

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Impact Score: 3.6

Exploitability Score: 2.2

Severity: MEDIUM