vulnwire
5.9med

CVE-2017-2624

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.

Published 8 y ago · modified 4 mo ago · JSON

CVSS
5.9
v3.0 · CNA
CISA KEV
No
not known exploited
EPSS
0.7%
percentile 53%
Public exploits
0
none known

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.

Exploit prediction (EPSS)

0.70% probability of exploitation in the next 30 days, higher than 53% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
CNA3.05.9CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
CNA3.05.9CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
NVD3.07.0CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD2.01.9AV:L/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Xorg xorg-x11-server

Classification

Weakness
  • CWE-385 Covert Timing Channel
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

  • security.gentoo.org /glsa/201704-03 · vendor-advisory, x_refsource_GENTOO, x_transferred
  • gitlab.freedesktop.org /xorg/xserver/commit/d7ac755f0b618eb1259d93c8a16ec6e39a18627c · x_refsource_CONFIRM, x_transferred
  • securitytracker.com /id/1037919 · vdb-entry, x_refsource_SECTRACK, x_transferred
  • lists.debian.org /debian-lts-announce/2017/11/msg00032.html · mailing-list, x_refsource_MLIST, x_transferred
  • security.gentoo.org /glsa/201710-30 · vendor-advisory, x_refsource_GENTOO, x_transferred
  • securityfocus.com /bid/96480 · vdb-entry, x_refsource_BID, x_transferred
  • x41-dsec.de /lab/advisories/x41-2017-001-xorg/ · x_refsource_MISC, x_transferred
  • bugzilla.redhat.com /show_bug.cgi?id=CVE-2017-2624 · x_refsource_CONFIRM, x_transferred

Sources

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