Vulnerability Details : CVE-2017-2624
Potential exploit
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.
Vulnerability category: Information leak
Products affected by CVE-2017-2624
- cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:a:x.org:xorg-server:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-2624
0.11%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 30 %
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
-
http://www.securitytracker.com/id/1037919
X Multiple Flaws Let Local Users Conduct Timing and Key Guessing Attacks Obtain Elevated Privileges - SecurityTrackerThird Party Advisory;VDB Entry
-
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624
1424984 – (CVE-2017-2624) CVE-2017-2624 xorg-x11-server: timing attack against MIT CookieExploit;Issue Tracking;Third Party Advisory
-
https://security.gentoo.org/glsa/201704-03
X.Org: Multiple vulnerabilities (GLSA 201704-03) — Gentoo securityThird Party Advisory
-
https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/
Advisory X41-2017-001: Multiple Vulnerabilities in X.org | X41 D-SEC GmbHExploit;Third Party Advisory
-
https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c
Use timingsafe_memcmp() to compare MIT-MAGIC-COOKIES CVE-2017-2624 (d7ac755f) · Commits · xorg / xserver · GitLabPatch;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html
[SECURITY] [DLA 1186-1] xorg-server security updateThird Party Advisory
-
https://security.gentoo.org/glsa/201710-30
X.Org Server: Multiple vulnerabilities (GLSA 201710-30) — Gentoo securityThird Party Advisory
-
http://www.securityfocus.com/bid/96480
X.org X Server Local Multiple Security VulnerabilitiesThird Party Advisory;VDB Entry
Jump to