Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| X.Org | X Server | <= 1.19.4 |
| Debian | Debian Linux | 7.0 |
Related Weaknesses (CWE)
References
- http://www.securityfocus.com/bid/96480Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037919Third Party AdvisoryVDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624ExploitIssue TrackingThird Party Advisory
- https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ecPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2017/11/msg00032.htmlThird Party Advisory
- https://security.gentoo.org/glsa/201704-03Third Party Advisory
- https://security.gentoo.org/glsa/201710-30Third Party Advisory
- https://www.x41-dsec.de/lab/advisories/x41-2017-001-xorg/ExploitThird Party Advisory
- http://www.securityfocus.com/bid/96480Third Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1037919Third Party AdvisoryVDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2624ExploitIssue TrackingThird Party Advisory
- https://gitlab.freedesktop.org/xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ecPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2017/11/msg00032.htmlThird Party Advisory
- https://security.gentoo.org/glsa/201704-03Third Party Advisory
- https://security.gentoo.org/glsa/201710-30Third Party Advisory
FAQ
What is CVE-2017-2624?
CVE-2017-2624 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 Xor...
How severe is CVE-2017-2624?
CVE-2017-2624 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2017-2624?
Check the references section above for vendor advisories and patch information. Affected products include: X.Org X Server, Debian Debian Linux.