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CVE-2018-18955
N/ADescription
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.
CVE Details
CVSS v3.1 ScoreN/A
Published11/16/2018
Last Modified11/21/2024
Sourcenvd
Honeypot Sightings0
Affected Products
canonical:ubuntu_linuxlinux:linux_kernel
Weaknesses (CWE)
CWE-863
References
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd(cve@mitre.org)
http://www.securityfocus.com/bid/105941(cve@mitre.org)
https://security.netapp.com/advisory/ntap-20190416-0003/(cve@mitre.org)
https://support.f5.com/csp/article/K39103040(cve@mitre.org)
https://usn.ubuntu.com/3832-1/(cve@mitre.org)
https://usn.ubuntu.com/3833-1/(cve@mitre.org)
https://usn.ubuntu.com/3835-1/(cve@mitre.org)
https://usn.ubuntu.com/3836-1/(cve@mitre.org)
https://usn.ubuntu.com/3836-2/(cve@mitre.org)
https://www.exploit-db.com/exploits/45886/(cve@mitre.org)
https://www.exploit-db.com/exploits/45915/(cve@mitre.org)
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd(af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/105941(af854a3a-2127-422b-91ae-364da2661108)
https://bugs.chromium.org/p/project-zero/issues/detail?id=1712(af854a3a-2127-422b-91ae-364da2661108)
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19(af854a3a-2127-422b-91ae-364da2661108)
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2(af854a3a-2127-422b-91ae-364da2661108)
https://github.com/torvalds/linux/commit/d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd(af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20190416-0003/(af854a3a-2127-422b-91ae-364da2661108)
https://support.f5.com/csp/article/K39103040(af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/3832-1/(af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/3833-1/(af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/3835-1/(af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/3836-1/(af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/3836-2/(af854a3a-2127-422b-91ae-364da2661108)
https://www.exploit-db.com/exploits/45886/(af854a3a-2127-422b-91ae-364da2661108)
https://www.exploit-db.com/exploits/45915/(af854a3a-2127-422b-91ae-364da2661108)
IOC Correlations
No correlations recorded
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