| Name | CVE-2020-11935 |
| Description | It was discovered that aufs improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service attack. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 964748 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| aufs (PTS) | stretch | 4.9+20161219-1 | vulnerable |
| buster | 4.19+20190211-1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| aufs | source | (unstable) | (unfixed) | | | 964748 |
Notes
[buster] - aufs <no-dsa> (Minor issue; CONFIG_IMA not enabled in kernel; can be fixed via point release)
[stretch] - aufs <ignored> (Minor issue; too many other aufs issues open)
To exploit the issue CONFIG_IMA in Kernel needs to be enabled.
linux/4.9.y had the config enabled, but was disabled in later versions
including linux/4.19.y.
https://sourceforge.net/p/aufs/mailman/message/37048642/
https://github.com/sfjro/aufs4-linux/commit/515a586eeef31e0717d5dea21e2c11a965340b3c
https://github.com/sfjro/aufs4-linux/commit/f10aea57d39d6cd311312e9e7746804f7059b5c8