Vulnerability Name:

CVE-2018-6922

Assigned:2018-08-06
Published:2018-08-06
Updated:2018-08-16
Summary:One of the data structures that holds TCP segments in all versions of FreeBSD prior to 11.2-RELEASE-p1, 11.1-RELEASE-p12, and 10.4-RELEASE-p10 uses an inefficient algorithm to reassemble the data. This causes the CPU time spent on segment processing to grow linearly with the number of segments in the reassembly queue. An attacker who has the ability to send TCP traffic to a victim system can degrade the victim system's network performance and/or consume excessive CPU by exploiting the inefficiency of TCP reassembly handling, with relatively small bandwidth cost.
CVSS v3 Severity:7.5 High (CCN CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
6.5 Medium (CCN Temporal CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:7.8 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Complete
References:Source: BID
Type: UNKNOWN
105058

Source: SECTRACK
Type: UNKNOWN
1041425

Source: XF
Type: UNKNOWN
freebsd-cve20186922-dos(148026)

Source: CONFIRM
Type: UNKNOWN
https://security.netapp.com/advisory/ntap-20180815-0002/

Source: FREEBSD
Type: UNKNOWN
FreeBSD-SA-18:08

Vulnerable Configuration:
Configuration CCN 1:
  • cpe:/o:freebsd:freebsd:11.1:*:*:*:*:*:*:*
  • OR cpe:/o:freebsd:freebsd:10.4:*:*:*:*:*:*:*

  • * Denotes that component is vulnerable
    BACK
    freebsd freebsd 11.1
    freebsd freebsd 10.4