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CVE-2017-2624

It was found that xorg-x11-server before 1.19.0 including uses memcmp() to check the received MIT...

5.9 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.70%Down 1.2 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 5.9

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.

Record
CVE-2017-2624
CVSS 3.0
5.9 MediumCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Weakness
CWE-385
Updated
2026-11-02
EUVDEUVD-2017-11785 5.9

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.

Record
EUVD-2017-11785
CVSS 3.0
5.9 MediumCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-6pw7-qhf8-rjff 7.0

It was found that xorg-x11-server before 1.19.0 including uses memcmp() to check the received MIT...

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.

Record
GHSA-6pw7-qhf8-rjff
CVSS 3.0
7.0 HighCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-200, CWE-385
Updated
2026-11-02
NVD 5.9

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.

Record
CVE-2017-2624
CVSS 3.0
5.9 MediumCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CVSS 3.0
7.0 HighCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
1.9 LowAV:L/AC:M/Au:N/C:P/I:N/A:N
Weakness
CWE-385, CWE-200
Updated
2026-11-02
OSV 7.0

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.

Record
CVE-2017-2624
CVSS 3.0
7.0 HighCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2017-2624 7.0

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.

Record
DEBIAN-CVE-2017-2624
CVSS 3.0
7.0 HighCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 6 moreShow less
OSVUBUNTU-CVE-2017-2624 7.0

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.

Record
UBUNTU-CVE-2017-2624
CVSS 3.0
7.0 HighCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 3.0
5.9 MediumCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
Updated
2026-11-02
OSVMGASA-2017-0269 No score

Updated x11-server packages fix security vulnerabilities

Eric Sesterhenn discovered that the X.Org X server incorrectly compared MIT cookies. An attacker could possibly use this issue to perform a timing attack and recover the MIT cookie (CVE-2017-2624).

It was discovered that the X.Org X server incorrectly handled endianness conversion of certain X events. An attacker able to connect to an X server, either locally or remotely, could use this issue to crash the server, or possibly execute arbitrary code as an administrator (CVE-2017-10971).

It was discovered that the X.Org X server incorrectly handled endianness conversion of certain X events. An attacker able to connect to an X server, either locally or remotely, could use this issue to possibly obtain sensitive information (CVE-2017-10972).

Use-after-free issue in an unused function in XDM (boo#1025035).

Record
MGASA-2017-0269
Updated
2026-11-02
OSVMGASA-2018-0200 No score

Updated nxagent packages fix security vulnerability

CVE-2017-2624: Timing attack against MIT Cookie

Record
MGASA-2018-0200
Updated
2026-11-02
OSVopenSUSE-SU-2024:11525-1 No score

xorg-x11-server-1.20.13-1.2 on GA media

These are all security issues fixed in the xorg-x11-server-1.20.13-1.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11525-1
Updated
2026-11-02
OSVSUSE-SU-2017:1675-1 No score

Security update for xorg-x11-server

This update for xorg-x11-server provides the following fixes:

  • Remove unused function with use-after-free issue. (bsc#1025035)
  • Use arc4random to generate cookies. (bsc#1025084)
  • Prevent timing attack against MIT cookie. (bsc#1025029, CVE-2017-2624)
  • XDrawArc performance improvement. (bsc#1019649)
  • Re-enable indirect GLX by default. (bsc#1039042)
  • Add IndirectGLX ServerFlags option which allows users to enable or disable indirect GLX. (bsc#1032509)
  • Fix dashing in GLAMOR. (bsc#1021803)
  • Fix X server crash on drawing dashed lines. (bsc#1025985)
Record
SUSE-SU-2017:1675-1
Updated
2026-11-02
OSVUSN-3362-1 No score

xorg-server, xorg-server-hwe-16.04, xorg-server-lts-xenial vulnerabilities

It was discovered that the X.Org X server incorrectly handled endianness conversion of certain X events. An attacker able to connect to an X server, either locally or remotely, could use this issue to crash the server, or possibly execute arbitrary code as an administrator. (CVE-2017-10971)

It was discovered that the X.Org X server incorrectly handled endianness conversion of certain X events. An attacker able to connect to an X server, either locally or remotely, could use this issue to possibly obtain sensitive information. (CVE-2017-10972)

Eric Sesterhenn discovered that the X.Org X server incorrectly compared MIT cookies. An attacker could possibly use this issue to perform a timing attack and recover the MIT cookie. (CVE-2017-2624)

Record
USN-3362-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
xorg-server
Debian:12
 before 2:1.19.2-1
2:1.19.2-1
xorg-server
Debian:13
 before 2:1.19.2-1
2:1.19.2-1
xorg-server
Debian:14
 before 2:1.19.2-1
2:1.19.2-1
xorg-server
Debian:7
 before 2:1.12.4-6+deb7u8, plus listed versions
2:1.12.4-62:1.12.4-6+deb7u12:1.12.4-6+deb7u22:1.12.4-6+deb7u32:1.12.4-6+deb7u42:1.12.4-6+deb7u52:1.12.4-6+deb7u62:1.12.4-6+deb7u7
2:1.12.4-6+deb7u8
x11-server
Mageia:5
 before 1.16.4-2.2.mga5
1.16.4-2.2.mga5
nx
Mageia:6
 before 3.5.0.33-1.mga6
3.5.0.33-1.mga6
xorg-x11-server
SUSE:Linux Enterprise Desktop 12 SP2
 before 7.6_1.18.3-71.1
7.6_1.18.3-71.1
xorg-x11-server
SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2
 before 7.6_1.18.3-71.1
7.6_1.18.3-71.1
xorg-x11-server
SUSE:Linux Enterprise Software Development Kit 12 SP2
 before 7.6_1.18.3-71.1
7.6_1.18.3-71.1
xorg-x11-server
SUSE:Linux Enterprise Server 12 SP2
 before 7.6_1.18.3-71.1
7.6_1.18.3-71.1
Show 6 moreShow less
Affected packages
PackageAffectedFixed
xorg-x11-server
SUSE:Linux Enterprise Server for SAP Applications 12 SP2
 before 7.6_1.18.3-71.1
7.6_1.18.3-71.1
xorg-server
Ubuntu:14.04:LTS
 before 2:1.15.1-0ubuntu2.9, plus listed versions
2:1.14.3-3ubuntu22:1.14.3-3ubuntu32:1.14.3-3ubuntu42:1.14.3-5ubuntu12:1.14.4-1ubuntu1
Show 17 moreShow less
2:1.14.4-1ubuntu22:1.14.4.901-0ubuntu22:1.14.5-1ubuntu22:1.14.5-1ubuntu42:1.15.0-1ubuntu12:1.15.0-1ubuntu22:1.15.0-1ubuntu32:1.15.0-1ubuntu42:1.15.0-1ubuntu62:1.15.0-1ubuntu72:1.15.1-0ubuntu12:1.15.1-0ubuntu22:1.15.1-0ubuntu2.12:1.15.1-0ubuntu2.42:1.15.1-0ubuntu2.52:1.15.1-0ubuntu2.62:1.15.1-0ubuntu2.7
2:1.15.1-0ubuntu2.9
xorg-server-lts-xenial
Ubuntu:14.04:LTS
 before 2:1.18.3-1ubuntu2.3~trusty2, plus listed versions
2:1.18.3-1ubuntu2.2~trusty12:1.18.3-1ubuntu2.2~trusty22:1.18.3-1ubuntu2.2~trusty32:1.18.3-1ubuntu2.3~trusty1
2:1.18.3-1ubuntu2.3~trusty2
xorg-server
Ubuntu:16.04:LTS
 before 2:1.18.4-0ubuntu0.3, plus listed versions
2:1.17.2-1ubuntu92:1.17.2-1ubuntu102:1.17.3-2ubuntu12:1.17.3-2ubuntu22:1.17.3-2ubuntu3
Show 9 moreShow less
2:1.17.3-2ubuntu42:1.18.1-1ubuntu32:1.18.1-1ubuntu42:1.18.3-1ubuntu12:1.18.3-1ubuntu22:1.18.3-1ubuntu2.22:1.18.3-1ubuntu2.32:1.18.4-0ubuntu0.12:1.18.4-0ubuntu0.2
2:1.18.4-0ubuntu0.3
xorg-server-hwe-16.04
Ubuntu:16.04:LTS
 before 2:1.18.4-1ubuntu6.1~16.04.2, plus listed versions
2:1.18.4-1ubuntu6.1~16.04.1
2:1.18.4-1ubuntu6.1~16.04.2
xorg-x11-server
openSUSE:Tumbleweed
 before 1.20.13-1.2
1.20.13-1.2

History

History
RecordedChangedSources
aliases, productsEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-2624 is a medium vulnerability (CVSS 5.9) in The Xorg Project Xorg-x11-server, published March 1, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.70%, the 53rd percentile. Fixed in xorg-server 2:1.19.2-1.

References

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