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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
MD5 | 0997e77626bf20fe372537310c94c69f
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
MD5 | 63968a584ee33d219857ed9bdd445938
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
MD5 | 729df00f6313e1ee60a63c8d339f79f4
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
MD5 | 0a9080e514b971f8e3b93234f434b566
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
MD5 | 0df1fca09fd3365c627651be6ec1e4ee
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