Exploitation Summary
EIP tracks 1 public exploit for CVE-2019-15793. PoCs published by Google Security Research.
AI-analyzed exploit summary This exploit demonstrates a reference counting flaw in the shiftfs filesystem implementation in Ubuntu 19.10 (kernel 5.3.0-19-generic), leading to a use-after-free condition. The PoC triggers a general protection fault by manipulating file descriptors and mmap operations.
Description
In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, several locations which shift ids translate user/group ids before performing operations in the lower filesystem were translating them into init_user_ns, whereas they should have been translated into the s_user_ns for the lower filesystem. This resulted in using ids other than the intended ones in the lower fs, which likely did not map into the shifts s_user_ns. A local attacker could use this to possibly bypass discretionary access control permissions.
Exploits (1)
This exploit demonstrates a reference counting flaw in the shiftfs filesystem implementation in Ubuntu 19.10 (kernel 5.3.0-19-generic), leading to a use-after-free condition. The PoC triggers a general protection fault by manipulating file descriptors and mmap operations.
References (3)
Scores
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N