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    Debian: DSA-2493-1: asterisk security update

    Date 12 Jun 2012
    122
    Posted By LinuxSecurity Advisories
    Several vulnerabilities were discovered in Asterisk, a PBX and telephony toolkit. CVE-2012-2947
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    Debian Security Advisory DSA-2493-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                            Florian Weimer
    June 12, 2012                          https://www.debian.org/security/faq
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    Package        : asterisk
    Vulnerability  : denial of service
    Problem type   : remote
    Debian-specific: no
    CVE ID         : CVE-2012-2947 CVE-2012-2948
    Debian Bug     : 675204 675210
    
    Several vulnerabilities were discovered in Asterisk, a PBX and
    telephony toolkit.
    
    CVE-2012-2947
    	The IAX2 channel driver allows remote attackers to cause a
    	denial of service (daemon crash) by placing a call on hold
    	(when a certain mohinterpret setting is enabled).
    
    CVE-2012-2948
    	The Skinny channel driver allows remote authenticated users to
    	cause a denial of service (NULL pointer dereference and daemon
    	crash) by closing a connection in off-hook mode.
    
    In addition, it was discovered that Asterisk does not set the
    alwaysauthreject option by default in the SIP channel driver.  This
    allows remote attackers to observe a difference in response behavior
    and check for the presence of account names.  (CVE-2011-2666)  System
    administrators concerned by this user enumerating vulnerability should
    enable the alwaysauthreject option in the configuration.  We do not
    plan to change the default setting in the stable version
    (Asterisk 1.6) in order to preserve backwards compatibility.
    
    For the stable distribution (squeeze), this problem has been fixed in
    version 1:1.6.2.9-2+squeeze6.
    
    For the testing distribution (wheezy) and the unstable distribution
    (sid), this problem has been fixed in version 1:1.8.13.0~dfsg-1.
    
    We recommend that you upgrade your asterisk 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.
    

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