Debian: DSA-4053-1: exim4 security update

    Date30 Nov 2017
    CategoryDebian
    112
    Posted ByLinuxSecurity Advisories
    Several vulnerabilities have been discovered in Exim, a mail transport agent. The Common Vulnerabilities and Exposures project identifies the following issues:
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-4053-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    November 30, 2017                     https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : exim4
    CVE ID         : CVE-2017-16943 CVE-2017-16944
    Debian Bug     : 882648 882671
    
    Several vulnerabilities have been discovered in Exim, a mail transport
    agent. The Common Vulnerabilities and Exposures project identifies the
    following issues:
    
    CVE-2017-16943
    
        A use-after-free vulnerability was discovered in Exim's routines
        responsible for parsing mail headers. A remote attacker can take
        advantage of this flaw to cause Exim to crash, resulting in a denial
        of service, or potentially for remote code execution.
    
    CVE-2017-16944
    
        It was discovered that Exim does not properly handle BDAT data
        headers allowing a remote attacker to cause Exim to crash, resulting
        in a denial of service.
    
    For the stable distribution (stretch), these problems have been fixed in
    version 4.89-2+deb9u2. Default installations disable advertising the
    ESMTP CHUNKING extension and are not affected by these issues.
    
    We recommend that you upgrade your exim4 packages.
    
    For the detailed security status of exim4 please refer to its security
    tracker page at:
    https://security-tracker.debian.org/tracker/exim4
    
    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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