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CVE-2019-15793

Status Candidate

Overview

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.

Related Files

Ubuntu shiftfs refcount Underflow / Type Confusion
Posted Nov 14, 2019
Authored by Jann Horn, Google Security Research

Ubuntu suffers from refcount underflow and type confusion vulnerabilities in shiftfs.

tags | exploit, vulnerability
systems | linux, ubuntu
advisories | CVE-2019-15793
SHA-256 | fc083eb6624e5af7dd882d1267361f52f304c19c1c96a185b84a12e9f221811d
Download | Favorite | View
Ubuntu Security Notice USN-4183-2
Posted Nov 14, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4183-2 - USN-4183-1 fixed vulnerabilities in the Linux kernel. It was discovered that the kernel fix for CVE-2019-0155 was incomplete on 64-bit Intel x86 systems. This update addresses the issue. Various other issues were also addressed.

tags | advisory, x86, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-12207, CVE-2019-0154, CVE-2019-0155, CVE-2019-11135, CVE-2019-15791, CVE-2019-15792, CVE-2019-15793, CVE-2019-16746, CVE-2019-17666
SHA-256 | db78d28cd507d49176624aa1c886c5cf61d842620b9c273cac92d9c264a69321
Download | Favorite | View
Ubuntu Security Notice USN-4184-2
Posted Nov 14, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4184-2 - USN-4184-1 fixed vulnerabilities in the Linux kernel. It was discovered that the kernel fix for CVE-2019-0155 was incomplete on 64-bit Intel x86 systems. Also, the update introduced a regression that broke KVM guests where extended page tables are disabled or not supported. This update addresses both issues. Various other issues were also addressed.

tags | advisory, x86, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2018-12207, CVE-2019-0154, CVE-2019-0155, CVE-2019-11135, CVE-2019-15098, CVE-2019-15791, CVE-2019-15792, CVE-2019-15793, CVE-2019-17052, CVE-2019-17053, CVE-2019-17054, CVE-2019-17055, CVE-2019-17056, CVE-2019-17666
SHA-256 | b7e4f5cb2e7a1b61d8abbcf5d64a6bd1b12b10f64ec69db57292af5b7c023804
Download | Favorite | View
Ubuntu Security Notice USN-4184-1
Posted Nov 13, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4184-1 - Stephan van Schaik, Alyssa Milburn, Sebastian

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-12207, CVE-2019-0154, CVE-2019-0155, CVE-2019-11135, CVE-2019-15098, CVE-2019-15791, CVE-2019-15792, CVE-2019-15793, CVE-2019-17052, CVE-2019-17053, CVE-2019-17054, CVE-2019-17055, CVE-2019-17056, CVE-2019-17666
SHA-256 | f763ad9fa1bb0569d1a1d43b73964d4d5336d7ffb344ff8b467dbf4ab792b730
Download | Favorite | View
Ubuntu Security Notice USN-4183-1
Posted Nov 13, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4183-1 - Stephan van Schaik, Alyssa Milburn, Sebastian

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2018-12207, CVE-2019-0154, CVE-2019-0155, CVE-2019-11135, CVE-2019-15791, CVE-2019-15792, CVE-2019-15793, CVE-2019-16746, CVE-2019-17666
SHA-256 | b0fa29cc4d567833d14869e133418cfc7ee6efd0a109277e3959075ccc278c0d
Download | Favorite | View
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