Debian: DSA-2305-1: vsftpd security update

    Date19 Sep 2011
    CategoryDebian
    54
    Posted ByLinuxSecurity Advisories
    Two security issue have been discovered that affect vsftpd, a lightweight, efficient FTP server written for security. CVE-2011-2189
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    Debian Security Advisory DSA-2305-1                    This email address is being protected from spambots. You need JavaScript enabled to view it.
    http://www.debian.org/security/                                 Nico Golde
    September 19, 2011                      http://www.debian.org/security/faq
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    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: http://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    
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