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[email protected]CVE-2017-2624

HistoryJul 27, 2018 - 6:29 p.m.

CVE-2017-2624

2018-07-2718:29:00

CWE-385

CWE-200

[email protected]

web.nvd.nist.gov

xorg-x11-server

vulnerability

brute force

attack

security

cve-2017-2624

nvd

1.9 Low

CVSS2

Attack Vector

LOCAL

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

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

7 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

6.7 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

52.0%

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.

Affected configurations

Vulners

NVD

Node

xorgx11Range≤1.19.0

VendorProductVersionCPE
xorgx11*cpe:2.3:a:xorg:x11:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
xorg	x11	*	cpe:2.3:a:xorg:x11::::::::

CNA Affected

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