CVE & CISA-KEV Catalog

CVE-2017-2624

MEDIUM
5.9
CVSS v3
NVD

Description

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.

CWE-385CWE-200Information Exposure

How to fix

Remediation Available
xorg-serverDebian
Fixed in:2:1.19.2-1CVE-2017-2624
Fixed in:2:1.19.2-1CVE-2017-2624
Fixed in:2:1.19.2-1CVE-2017-2624
Fixed in:2:1.19.2-1CVE-2017-2624
xorg-serverUbuntu
Fixed in:2:1.15.1-0ubuntu2.9USN-3362-1
Fixed in:2:1.18.4-0ubuntu0.3USN-3362-1
xorg-server-hwe-16.04Ubuntu
Fixed in:2:1.18.4-1ubuntu6.1~16.04.2USN-3362-1
xorg-server-lts-xenialUbuntu
Fixed in:2:1.18.3-1ubuntu2.3~trusty2USN-3362-1
xserver-xorg-coreUbuntu
Fixed in:2:1.15.1-0ubuntu2.9USN-3362-1
Fixed in:2:1.18.4-0ubuntu0.3USN-3362-1
xserver-xorg-core-hwe-16.04Ubuntu
Fixed in:2:1.18.4-1ubuntu6.1~16.04.2USN-3362-1
xserver-xorg-core-lts-xenialUbuntu
Fixed in:2:1.18.3-1ubuntu2.3~trusty2USN-3362-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityHigh
Privileges RequiredNone
User InteractionNone
ScopeChanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

0.68%probability of exploitation in 30 days
48thpercentile

Moderate risk: more likely to be exploited than 48% of all known CVEs.

References

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Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-08-29.