| Name | CVE-2011-2189 |
| Description | net/core/net_namespace.c in the Linux kernel 2.6.32 and earlier does not properly handle a high rate of creation and cleanup of network namespaces, which makes it easier for remote attackers to cause a denial of service (memory consumption) via requests to a daemon that requires a separate namespace per connection, as demonstrated by vsftpd. |
| 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 | 629373 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| vsftpd (PTS) | jessie | 3.0.2-17+deb8u1 | fixed |
| stretch | 3.0.3-8 | fixed |
| buster, bullseye | 3.0.3-12 | fixed |
| bookworm | 3.0.3-13 | fixed |
| sid, trixie | 3.0.3-13.1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| linux-2.6 | source | (unstable) | 2.6.35-1 | low | | |
| vsftpd | source | lenny | 2.0.7-1+lenny1 | | | |
| vsftpd | source | squeeze | 2.3.2-3+squeeze2 | | | |
| vsftpd | source | (unstable) | 2.3.4-1 | | | 629373 |
Notes
[lenny] - linux-2.6 <no-dsa> (attacker needs elevated CAP_SYS_ADMIN privileges to abuse this)
[squeeze] - linux-2.6 <no-dsa> (attacker needs elevated CAP_SYS_ADMIN privileges to abuse this)
this is technically a kernel bug. however this has been workarounded specifically
for vsftpd by adding a kernel check before using this feature, see DSA-2304-1
for details