CVE-2017-2624

2018-07-2718:00:00

CWE-385

redhat

www.cve.org

5.9 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

7.2 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

51.9%

JSON

It was found that xorg-x11-server before 1.19.0 including uses memcmp() to check the received MIT cookie against a series of valid cookies. If the cookie is correct, it is allowed to attach to the Xorg session. Since most memcmp() implementations return after an invalid byte is seen, this causes a time difference between a valid and invalid byte, which could allow an efficient brute force attack.

CNA Affected

[
  {
    "product": "xorg-x11-server",
    "vendor": "Xorg",
    "versions": [
      {
        "status": "affected",
        "version": "1.19.0"
      }
    ]
  }
]