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.
Published 2018-07-27 18:29:01
Updated 2019-10-09 23:26:58
Source Red Hat, Inc.
View at NVD,   CVE.org
Vulnerability category: Information leak

Exploit prediction scoring system (EPSS) score for CVE-2017-2624

0.15%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 51 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2017-2624

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
1.9
LOW AV:L/AC:M/Au:N/C:P/I:N/A:N
3.4
2.9
NIST
7.0
HIGH CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
1.0
5.9
NIST
5.9
MEDIUM CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
1.4
4.0
Red Hat, Inc.

CWE ids for CVE-2017-2624

  • The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.
    Assigned by: nvd@nist.gov (Primary)
  • Covert timing channels convey information by modulating some aspect of system behavior over time, so that the program receiving the information can observe system behavior and infer protected information.
    Assigned by: secalert@redhat.com (Secondary)

References for CVE-2017-2624

Products affected by CVE-2017-2624

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