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Vulnerability Details : CVE-2018-18955

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-namespaced direction.
Publish Date : 2018-11-16 Last Update Date : 2020-08-24
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- CVSS Scores & Vulnerability Types

CVSS Score
4.4
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Partial (There is reduced performance or interruptions in resource availability.)
Access Complexity Medium (The access conditions are somewhat specialized. Some preconditions must be satistified to exploit)
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Bypass a restriction or similar
CWE ID 863

- Products Affected By CVE-2018-18955

# Product Type Vendor Product Version Update Edition Language
1 OS Canonical Ubuntu Linux 16.04 * * * Version Details Vulnerabilities
2 OS Canonical Ubuntu Linux 18.04 * * * Version Details Vulnerabilities
3 OS Canonical Ubuntu Linux 18.10 * * * Version Details Vulnerabilities
4 OS Linux Linux Kernel * * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Canonical Ubuntu Linux 3
Linux Linux Kernel 1

- References For CVE-2018-18955

https://usn.ubuntu.com/3832-1/
UBUNTU USN-3832-1
https://www.exploit-db.com/exploits/45915/
EXPLOIT-DB 45915
https://security.netapp.com/advisory/ntap-20190416-0003/ CONFIRM
https://usn.ubuntu.com/3836-1/
UBUNTU USN-3836-1
https://usn.ubuntu.com/3835-1/
UBUNTU USN-3835-1
https://usn.ubuntu.com/3836-2/
UBUNTU USN-3836-2
https://usn.ubuntu.com/3833-1/
UBUNTU USN-3833-1
https://www.exploit-db.com/exploits/45886/
EXPLOIT-DB 45886
http://www.securityfocus.com/bid/105941
BID 105941 Linux Kernel CVE-2018-18955 Local Privilege Escalation Vulnerability Release Date:2018-11-16
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd
https://github.com/torvalds/linux/commit/d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd
https://bugs.chromium.org/p/project-zero/issues/detail?id=1712
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2
https://support.f5.com/csp/article/K39103040 CONFIRM

- Metasploit Modules Related To CVE-2018-18955

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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