Public exploit available
Public proof-of-concept or exploit code exists (ExploitDB / Metasploit / Nuclei).
CVE-2018-18955 — Incorrect Authorization in Kernel
Severity
7.0HIGHNVD
EPSS
9.6%
top 7.12%
CISA KEV
Not in KEV
Exploit
PoC available
Public exploit / PoC exists
Affected products
Timeline
PublishedNov 16
Latest updateMay 13
Description
In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAP_SYS_ADMIN in an affected user namespace can bypass access controls on resources outside the namespace, as demonstrated by reading /etc/shadow. This occurs because an ID transformation takes place properly for the namespaced-to-kernel direction but not for the kernel-to-namesp…
CVSS vector
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.0 | Impact: 5.9
Affected Packages4 packages
Also affects: Ubuntu Linux 16.04, 18.04, 18.10
Patches
🔴Vulnerability Details
6💥Exploits & PoCs
7Exploit-DB▶
Linux Kernel 4.15.x < 4.19.2 - 'map_write() CAP_SYS_ADMIN' Local Privilege Escalation (polkit Method)↗2019-01-04
Exploit-DB▶
Linux Kernel 4.15.x < 4.19.2 - 'map_write() CAP_SYS_ADMIN' Local Privilege Escalation (dbus Method)↗2019-01-04
Exploit-DB
▶
Exploit-DB▶
Linux Kernel 4.15.x < 4.19.2 - 'map_write() CAP_SYS_ADMIN' Local Privilege Escalation (ldpreload Method)↗2018-11-21
Exploit-DB▶
Linux Kernel 4.15.x < 4.19.2 - 'map_write() CAP_SYS_ADMIN' Local Privilege Escalation (cron Method)↗2018-11-21
📋Vendor Advisories
7📄Research Papers
1arXiv
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