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CVE
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CVE-2017-2624Date: (C)2018-08-04   (M)2023-12-22


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.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 7.0CVSS Score : 1.9
Exploit Score: 1.0Exploit Score: 3.4
Impact Score: 5.9Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: LOCALAccess Vector: LOCAL
Attack Complexity: HIGHAccess Complexity: MEDIUM
Privileges Required: LOWAuthentication: NONE
User Interaction: NONEConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: HIGHAvailability: NONE
Integrity: HIGH 
Availability: HIGH 
  
Reference:
SECTRACK-1037919
BID-96480
GLSA-201704-03
GLSA-201710-30
https://lists.debian.org/debian-lts-announce/2017/11/msg00032.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624
https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c
https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/

CPE    1
cpe:/o:debian:debian_linux:7.0
CWE    1
CWE-200
OVAL    7
oval:org.secpod.oval:def:89044479
oval:org.secpod.oval:def:114130
oval:org.secpod.oval:def:51850
oval:org.secpod.oval:def:114116
...

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