CVE-2018-18955
Vulnerability from cvelistv5
Published
2018-11-16 20:00
Modified
2024-08-05 11:23
Severity ?
Summary
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.
References
cve@mitre.orghttp://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bdPatch, Vendor Advisory
cve@mitre.orghttp://www.securityfocus.com/bid/105941Third Party Advisory, VDB Entry
cve@mitre.orghttps://bugs.chromium.org/p/project-zero/issues/detail?id=1712Patch, Third Party Advisory
cve@mitre.orghttps://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19Patch, Vendor Advisory
cve@mitre.orghttps://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.2Patch, Vendor Advisory
cve@mitre.orghttps://github.com/torvalds/linux/commit/d2f007dbe7e4c9583eea6eb04d60001e85c6f1bdPatch, Vendor Advisory
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20190416-0003/
cve@mitre.orghttps://support.f5.com/csp/article/K39103040
cve@mitre.orghttps://usn.ubuntu.com/3832-1/Third Party Advisory
cve@mitre.orghttps://usn.ubuntu.com/3833-1/Third Party Advisory
cve@mitre.orghttps://usn.ubuntu.com/3835-1/Third Party Advisory
cve@mitre.orghttps://usn.ubuntu.com/3836-1/Third Party Advisory
cve@mitre.orghttps://usn.ubuntu.com/3836-2/Third Party Advisory
cve@mitre.orghttps://www.exploit-db.com/exploits/45886/Exploit, Patch, Third Party Advisory, VDB Entry
cve@mitre.orghttps://www.exploit-db.com/exploits/45915/Exploit, Third Party Advisory, VDB Entry
Impacted products
n/an/a
Show details on NVD website

To clipboard 

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  }
}


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