VDB
CVE-2019-15793
CVE-2019-15793
PUBLISHED
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.
EPSS 0.03% · 10.3th percentile
Risk Scores
EPSS Score
0.03%
10.3th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:24.04:LTS | linux-raspi-realtime | 0, 6.8.0-2019.20 |
| Ubuntu:20.04:LTS | linux-raspi2 | 5.3.0-1007.8, 5.3.0-1014.16, 5.3.0-1015.17 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | 0, 5.15.0-1073.75 |
| Ubuntu:18.04:LTS | linux-gcp-edge | 5.0.0-1011.11~18.04.1, 0, 5.0.0-1013.13~18.04.1 |
| Ubuntu:16.04:LTS | linux-hwe-edge | 4.15.0-20.21~16.04.1, 0, 4.8.0-30.32~16.04.1 |
| Ubuntu:20.04:LTS | linux-riscv | 5.4.0-36.41, 5.4.0-39.44, 0 |
| Ubuntu:20.04:LTS | linux-gkeop-5.15 | 5.15.0-1043.50~20.04.1, 5.15.0-1035.41~20.04.1, 5.15.0-1034.40~20.04.1 |
| Ubuntu:20.04:LTS | linux-azure-fde | 5.4.0-1085.90+cvm1.1, 5.4.0-1085.90+cvm2.1, * |
| Ubuntu:20.04:LTS | linux-gke | 5.4.0-1084.90, 5.4.0-1033.35, 5.4.0-1035.37 |
| Ubuntu:18.04:LTS | linux-hwe-edge | 5.0.0-19.20~18.04.1, 5.3.0-23.25~18.04.2, 5.3.0-24.26~18.04.2 |
| Ubuntu:22.04:LTS | linux-realtime | 0, 5.15.0-1032.35 |
| Ubuntu:22.04:LTS | linux-riscv | 5.15.0-1015.17, 5.15.0-1014.16, 5.15.0-1012.13 |
| Ubuntu:20.04:LTS | linux-gkeop | 5.4.0-1061.65, 5.4.0-1057.61, 5.4.0-1054.57 |
| Ubuntu:18.04:LTS | linux-azure-edge | 0, 5.0.0-1012.12~18.04.2, 4.18.0-1008.8~18.04.1 |
Exploit Intelligence
- CIRCL exploited: CVE-2019-15793 (circl-sighting)
- https://usn.ubuntu.com/usn/usn-4183-1 (circl)
- https://usn.ubuntu.com/usn/usn-4184-1 (circl)
- https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/eoan/commit/?id=3644b9d5688da86f18e017c9c580b75cf52927bb (circl)
- vulnerability_exploit_rules.yar (github-yara)
- vulnerability_exploit_rules.yar (github-yara)
- vulnerability_exploit_rules.yar (github-yara)
- vulnerability_exploit_rules.yar (github-yara)
- vulnerability_exploit_rules.yar (github-yara)
- Ubuntu 19.10 - Refcount Underflow and Type Confusion in shiftfs Exploit (0day-today)
…and 1 more exploits
Timeline
- Nov 12, 2019 CVE Published
- Nov 20, 2019 PoC Published
- Nov 20, 2019 PoC Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 24, 2021 EPSS Score
- Oct 26, 2021 EPSS Score
- Dec 27, 2021 EPSS Score
- Feb 28, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 1, 2022 EPSS Score
- Jul 3, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2019-15793 third-party-advisory
- https://ubuntu.com/security/notices/USN-4183-1 vendor-advisory
- https://ubuntu.com/security/notices/USN-4184-1 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2019-15793 third-party-advisory