In the Linux kernel 4.15.x up to and including 4.19.x prior to 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.
Vulnerable Product | Search on Vulmon | Subscribe to Product |
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linux linux kernel |
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canonical ubuntu linux 16.04 |
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canonical ubuntu linux 18.04 |
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canonical ubuntu linux 18.10 |