NULL pointer dereference in FreeBSD - CVE-2018-6925
Published: September 28, 2018 / Updated: August 8, 2020
Vulnerability identifier: #VU36608
CSH Severity: Medium
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-6925
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in FreeBSD before 11.2-STABLE(r338986), 11.2-RELEASE-p4, 11.1-RELEASE-p15, 10.4-STABLE(r338985), and 10.4-RELEASE-p13, due to improper maintenance of IPv6 protocol control block flags through various failure paths, an unprivileged authenticated local user may be able to cause a NULL pointer dereference causing the kernel to crash. A remote attacker can perform a denial of service (DoS) attack.
Affected software
FreeBSD
Junos OS
Junos OS
How to mitigate CVE-2018-6925
Update to version 11.2.
FreeBSD - update to 11.2
Junos OS - addressed in versions 12.3X48-D95, 12.3R12-S15, 12.3R12-S19, 13.2X51-D40, 14.1X53-D30, 14.1X53-D53, 15.1x49-D190, 15.1R7-S6, 15.1R7-S9, 15.1R7-S10, 16.1R7-S6, 16.2R3, 17.1R2-S11, 17.1R3-S1, 17.2R1-S9, 17.2R2-S8, 17.2R3-S3, 17.3R2-S5, 17.3R3-S6, 17.3R3-S11, 17.3R3-S12, 17.4R2-S7, 17.4R2-S13, 17.4R3, 17.4R3-S5, 18.1R3-S8, 18.1R3-S13, 18.2R2-S7, 18.2R3-S1, 18.2R3-S8, 18.3R1-S5, 18.3R2-S2, 18.3R3, 18.3R3-S5, 18.4R1-S4, 18.4R2-S1, 18.4R2-S10, 18.4R3, 18.4R3-S8, 18.4R3-S10, 19.1R1-S3, 19.1R2, 19.1R3, 19.1R3-S5, 19.1R3-S7, 19.1R3-S9, 19.2R1-S1, 19.2R1-S7, 19.2R1-S8, 19.2R1-S9, 19.2R2, 19.2R3-S2, 19.2R3-S4, 19.2R3-S5, 19.3R1, 19.3R2-S6, 19.3R3, 19.3R3-S2, 19.3R3-S4, 19.3R3-S5, 19.3R3-S6, 19.4R1-S4, 19.4R2, 19.4R2-S4, 19.4R2-S6, 19.4R2-S7, 19.4R2-S8, 19.4R3-S3, 19.4R3-S6, 19.4R3-S7, 19.4R3-S8, 19.4R3-S9, 19.4R3-S10, 20.1R1, 20.1R2-S2, 20.1R3, 20.1R3-S3, 20.1R3-S4, 20.2R2-S3, 20.2R3, 20.2R3-S3, 20.2R3-S4, 20.2R3-S5, 20.2R3-S6, 20.3R2, 20.3R3-S2, 20.3R3-S3, 20.3R3-S4, 20.3R3-S5, 20.3R3-S6, 20.4R1-S1, 20.4R2, 20.4R3, 20.4R3-S1, 20.4R3-S3, 20.4R3-S4, 20.4R3-S5, 20.4R3-S8, 21.1R1, 21.1R2, 21.1R3-S1, 21.1R3-S3, 21.1R3-S4, 21.2R1, 21.2R2-S1, 21.2R2-S2, 21.2R3, 21.2R3-S1, 21.2R3-S2, 21.2R3-S4, 21.2R3-S6, 21.3R2, 21.3R3-S1, 21.3R3-S3, 21.3R3-S5, 21.4R1, 21.4R1-S1, 21.4R2, 21.4R2-S1, 21.4R3, 21.4R3-S1, 21.4R3-S4, 22.1R1, 22.1R1-S2, 22.1R2, 22.1R2-S2, 22.1R3, 22.1R3-S3, 22.2R1, 22.2R1-S1, 22.2R2, 22.2R2-S1, 22.2R3, 22.2R3-S1, 22.3R1, 22.3R1-S1, 22.3R2, 22.3R2-S2, 22.3R3, 22.4R1, 22.4R2-S1, 22.4R3, 23.2R1
Junos OS - addressed in versions 12.3X48-D95, 12.3R12-S15, 12.3R12-S19, 13.2X51-D40, 14.1X53-D30, 14.1X53-D53, 15.1x49-D190, 15.1R7-S6, 15.1R7-S9, 15.1R7-S10, 16.1R7-S6, 16.2R3, 17.1R2-S11, 17.1R3-S1, 17.2R1-S9, 17.2R2-S8, 17.2R3-S3, 17.3R2-S5, 17.3R3-S6, 17.3R3-S11, 17.3R3-S12, 17.4R2-S7, 17.4R2-S13, 17.4R3, 17.4R3-S5, 18.1R3-S8, 18.1R3-S13, 18.2R2-S7, 18.2R3-S1, 18.2R3-S8, 18.3R1-S5, 18.3R2-S2, 18.3R3, 18.3R3-S5, 18.4R1-S4, 18.4R2-S1, 18.4R2-S10, 18.4R3, 18.4R3-S8, 18.4R3-S10, 19.1R1-S3, 19.1R2, 19.1R3, 19.1R3-S5, 19.1R3-S7, 19.1R3-S9, 19.2R1-S1, 19.2R1-S7, 19.2R1-S8, 19.2R1-S9, 19.2R2, 19.2R3-S2, 19.2R3-S4, 19.2R3-S5, 19.3R1, 19.3R2-S6, 19.3R3, 19.3R3-S2, 19.3R3-S4, 19.3R3-S5, 19.3R3-S6, 19.4R1-S4, 19.4R2, 19.4R2-S4, 19.4R2-S6, 19.4R2-S7, 19.4R2-S8, 19.4R3-S3, 19.4R3-S6, 19.4R3-S7, 19.4R3-S8, 19.4R3-S9, 19.4R3-S10, 20.1R1, 20.1R2-S2, 20.1R3, 20.1R3-S3, 20.1R3-S4, 20.2R2-S3, 20.2R3, 20.2R3-S3, 20.2R3-S4, 20.2R3-S5, 20.2R3-S6, 20.3R2, 20.3R3-S2, 20.3R3-S3, 20.3R3-S4, 20.3R3-S5, 20.3R3-S6, 20.4R1-S1, 20.4R2, 20.4R3, 20.4R3-S1, 20.4R3-S3, 20.4R3-S4, 20.4R3-S5, 20.4R3-S8, 21.1R1, 21.1R2, 21.1R3-S1, 21.1R3-S3, 21.1R3-S4, 21.2R1, 21.2R2-S1, 21.2R2-S2, 21.2R3, 21.2R3-S1, 21.2R3-S2, 21.2R3-S4, 21.2R3-S6, 21.3R2, 21.3R3-S1, 21.3R3-S3, 21.3R3-S5, 21.4R1, 21.4R1-S1, 21.4R2, 21.4R2-S1, 21.4R3, 21.4R3-S1, 21.4R3-S4, 22.1R1, 22.1R1-S2, 22.1R2, 22.1R2-S2, 22.1R3, 22.1R3-S3, 22.2R1, 22.2R1-S1, 22.2R2, 22.2R2-S1, 22.2R3, 22.2R3-S1, 22.3R1, 22.3R1-S1, 22.3R2, 22.3R2-S2, 22.3R3, 22.4R1, 22.4R2-S1, 22.4R3, 23.2R1