Linux Security
Linux Security
Linux Security

Debian: DSA-2305-1: vsftpd security update

Date 19 Sep 2011
161
Posted By LinuxSecurity Advisories
Two security issue have been discovered that affect vsftpd, a lightweight, efficient FTP server written for security. CVE-2011-2189
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- --------------------------------------------------------------------------
Debian Security Advisory DSA-2305-1                    This email address is being protected from spambots. You need JavaScript enabled to view it.
https://www.debian.org/security/                                 Nico Golde
September 19, 2011                      https://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : vsftpd
Vulnerability  : denial of service
Problem type   : remote
Debian-specific: no
Debian bug     : 622741 629373
CVE IDs        : CVE-2011-0762 CVE-2011-2189

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.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/

Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.

LinuxSecurity Poll

How frequently do you patch/update your system?

No answer selected. Please try again.
Please select either existing option or enter your own, however not both.
Please select minimum 0 answer(s) and maximum 3 answer(s).
/main-polls/52-how-frequently-do-you-patch-update-your-system?task=poll.vote&format=json
52
radio
[{"id":"179","title":"As soon as patches\/updates are released - I track advisories for my distro(s) diligently","votes":"43","type":"x","order":"1","pct":81.13,"resources":[]},{"id":"180","title":"Every so often, when I think of it","votes":"5","type":"x","order":"2","pct":9.43,"resources":[]},{"id":"181","title":"Hardly ever","votes":"5","type":"x","order":"3","pct":9.43,"resources":[]}] ["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"] ["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"] 350

Please vote first in order to view vote results.

VOTE ON THE POLL PAGE


VIEW MORE POLLS

bottom 200

Please enable / Bitte aktiviere JavaScript!
Veuillez activer / Por favor activa el Javascript![ ? ]

We use cookies to provide and improve our services. By using our site, you consent to our Cookie Policy.