vsftpd - denial of service

Two security issue have been discovered that affect vsftpd, a lightweight,
efficient FTP server written for security.

• CVE-2011-2189
  It was discovered that Linux kernels < 2.6.35 are considerably slower in
  releasing than in the creation of network namespaces. As a result of this
  and because vsftpd is using this feature as a security enhancement to
  provide network isolation for connections, it is possible to cause denial
  of service conditions due to excessive memory allocations by the kernel.
  This is technically no vsftpd flaw, but a kernel issue. However, this
  feature has legitimate use cases and backporting the specific kernel patch
  is too intrusive. Additionally, a local attacker requires the CAP_SYS_ADMIN
  capability to abuse this functionality. Therefore, as a fix, a kernel
  version check has been added to vsftpd in order to disable this feature
  for kernels < 2.6.35.
• CVE-2011-0762
  Maksymilian Arciemowicz discovered that vsftpd is incorrectly handling
  certain glob expressions in STAT commands. This allows a remote authenticated
  attacker to conduct denial of service attacks (excessive CPU and process
  slot exhaustion) via crafted STAT commands.

For the oldstable distribution (lenny), this problem has been fixed in
version 2.0.7-1+lenny1.

For the stable distribution (squeeze), this problem has been fixed in
version 2.3.2-3+squeeze2. Please note that

CVE-2011-2189 does not affect the lenny version.

For the testing distribution (wheezy), this problem will be fixed soon.

For the unstable distribution (sid), this problem has been fixed in
version 2.3.4-1.

We recommend that you upgrade your vsftpd packages.