CVE-2019-15793
Mishandling of file-system uid/gid with namespaces in shiftfs
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 5.3.0-22.24, 5.0.0-35.38
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- 1 on Exploit-DB
Summary
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.
Timeline
- Public exploit on Exploit-DB
EDB-47693
- CVE published
- Record last updated
Affected versions
- Ubuntu Shiftfs in the Linux kernel
From 5.3.0-11.12 · fixed in 5.3.0-22.24; From 5.0 kernel · fixed in 5.0.0-35.38