CVE-2018-13405: canonical ubuntu_linux Improper Privilege Management
Vulnerability summary
CVE-2018-13405 is a high (CVSS 7.8) Improper Privilege Management vulnerability in canonical ubuntu_linux. EPSS estimates a 1.04% chance of exploitation in the next 30 days, higher than 63.9% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (exploit-database, 16-07-2018)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 36 · Related 22Timeline
- 06-07-2018PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
The inode_init_owner function in fs/inode.c in the Linux kernel through 3.16 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID.
CVSS metrics
6 scores · 4 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
EPSS trend
Probability
1.04%
Chance of exploitation in the next 30 days
Percentile
64%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.04% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundLinux (Ubuntu) - Other Users coredumps Can Be Read via setgid Directory and killpriv Bypass
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat37 products
- enterprise_linux_aus7.4
- enterprise_linux_desktop6.0 | 7.0
- enterprise_linux_eus7.4 | 7.5
- enterprise_linux_for_real_time7
- enterprise_linux_server6.0 | 7.0
Ubuntu17 products
- linux< 3.13.0-157.207 | < 4.4.0-134.160 | < 4.15.0-33.36
- linux-aws< 4.4.0-1028.31 | < 4.4.0-1066.76 | < 4.15.0-1020.20
- linux-azure< 4.15.0-1022.22~16.04.1 | < 4.15.0-1022.23
- linux-azure-fdeAll versions (No fix recorded)
- linux-fips< 4.4.0-1008.10
F513 products
- big-ip_access_policy_manager≥ 13.0.0, < 13.1.3.5 | ≥ 14.0.0, < 14.1.3.1 | ≥ 15.0.0, < 15.0.1.4 | 15.1.0 | 16.0.0
- big-ip_advanced_firewall_manager≥ 13.0.0, < 13.1.3.5 | ≥ 14.0.0, < 14.1.3.1 | ≥ 15.0.0, < 15.0.1.4 | 15.1.0 | 16.0.0
- big-ip_analytics≥ 13.0.0, < 13.1.3.5 | ≥ 14.0.0, < 14.1.3.1 | ≥ 15.0.0, < 15.0.1.4 | 15.1.0 | 16.0.0
- big-ip_application_acceleration_manager≥ 13.0.0, < 13.1.3.5 | ≥ 14.0.0, < 14.1.3.1 | ≥ 15.0.0, < 15.0.1.4 | 15.1.0 | 16.0.0
- big-ip_application_security_manager≥ 13.0.0, < 13.1.3.5 | ≥ 14.0.0, < 14.1.3.1 | ≥ 15.0.0, < 15.0.1.4 | 15.1.0 | 16.0.0
Debian2 products
- linux< 4.17.6-1
- debian_linuxEOL8.0 | 9.0
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04
Fedoraproject1 product
- fedoraEOL34 | 35
Linux1 product
- linux_kernel≤ 3.16
7 vendors · 72 products
References
45 links
lists.debian.org/debian-lts-announce/2018/08/msg00014.htmlMailing ListX Refsource MLISTThird Party Advisory
Show all 45 references
- github.com/torvalds/linux/commit/0fa3ecd87848c9c93c2c828ef4c3a8ca36ce46c7X Refsource MISCPatchThird Party Advisory
- access.redhat.com/errata/RHSA-2019:0717Vendor AdvisoryX Refsource REDHATThird Party AdvisoryAdvisory
- access.redhat.com/errata/RHSA-2019:2566Vendor AdvisoryX Refsource REDHATThird Party AdvisoryAdvisory
