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    Debian LTS: DLA-2280-1: python3.5 security update

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    Multiple security issues were discovered in Python, an interactive high-level object-oriented language. CVE-2018-20406
    
    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-2280-1                This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/lts/security/                                     
    July 15, 2020                                 https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------
    
    Package        : python3.5
    Version        : 3.5.3-1+deb9u2
    CVE ID         : CVE-2018-20406 CVE-2018-20852 CVE-2019-5010 CVE-2019-9636
                     CVE-2019-9740 CVE-2019-9947 CVE-2019-9948 CVE-2019-10160
                     CVE-2019-16056 CVE-2019-16935 CVE-2019-18348 CVE-2020-8492
                     CVE-2020-14422
    Debian Bug     : 924072 921064 940901
    
    Multiple security issues were discovered in Python, an interactive
    high-level object-oriented language.
    
    CVE-2018-20406
    
        Modules/_pickle.c has an integer overflow via a large LONG_BINPUT
        value that is mishandled during a "resize to twice the size"
        attempt. This issue might cause memory exhaustion, but is only
        relevant if the pickle format is used for serializing tens or
        hundreds of gigabytes of data.
    
    CVE-2018-20852
    
        http.cookiejar.DefaultPolicy.domain_return_ok in
        Lib/http/cookiejar.py does not correctly validate the domain: it
        can be tricked into sending existing cookies to the wrong
        server. An attacker may abuse this flaw by using a server with a
        hostname that has another valid hostname as a suffix (e.g.,
        pythonicexample.com to steal cookies for example.com). When a
        program uses http.cookiejar.DefaultPolicy and tries to do an HTTP
        connection to an attacker-controlled server, existing cookies can
        be leaked to the attacker.
    
    CVE-2019-5010
    
        An exploitable denial-of-service vulnerability exists in the X509
        certificate parser. A specially crafted X509 certificate can cause
        a NULL pointer dereference, resulting in a denial of service. An
        attacker can initiate or accept TLS connections using crafted
        certificates to trigger this vulnerability.
    
    CVE-2019-9636
    
        Improper Handling of Unicode Encoding (with an incorrect netloc)
        during NFKC normalization. The impact is: Information disclosure
        (credentials, cookies, etc. that are cached against a given
        hostname). The components are: urllib.parse.urlsplit,
        urllib.parse.urlparse. The attack vector is: A specially crafted
        URL could be incorrectly parsed to locate cookies or
        authentication data and send that information to a different host
        than when parsed correctly.
    
    CVE-2019-9740
    
        An issue was discovered in urllib2. CRLF injection is possible if
        the attacker controls a url parameter, as demonstrated by the
        first argument to urllib.request.urlopen with \r\n (specifically
        in the query string after a ? character) followed by an HTTP
        header or a Redis command.
    
    CVE-2019-9947
    
        An issue was discovered in urllib2. CRLF injection is possible if
        the attacker controls a url parameter, as demonstrated by the
        first argument to urllib.request.urlopen with \r\n (specifically
        in the path component of a URL that lacks a ? character) followed
        by an HTTP header or a Redis command. This is similar to the
        CVE-2019-9740 query string issue.
    
    CVE-2019-9948
    
        urllib supports the local_file: scheme, which makes it easier for
        remote attackers to bypass protection mechanisms that blacklist
        file: URIs, as demonstrated by triggering a
        urllib.urlopen('local_file:///etc/passwd') call.
    
    CVE-2019-10160
    
        A security regression was discovered in python, which still allows
        an attacker to exploit CVE-2019-9636 by abusing the user and
        password parts of a URL. When an application parses user-supplied
        URLs to store cookies, authentication credentials, or other kind
        of information, it is possible for an attacker to provide
        specially crafted URLs to make the application locate host-related
        information (e.g. cookies, authentication data) and send them to a
        different host than where it should, unlike if the URLs had been
        correctly parsed. The result of an attack may vary based on the
        application.
    
    CVE-2019-16056
    
        The email module wrongly parses email addresses that contain
        multiple @ characters. An application that uses the email module
        and implements some kind of checks on the From/To headers of a
        message could be tricked into accepting an email address that
        should be denied. An attack may be the same as in CVE-2019-11340;
        however, this CVE applies to Python more generally.
    
    CVE-2019-16935
    
        The documentation XML-RPC server has XSS via the server_title
        field. This occurs in Lib/xmlrpc/server.py. If set_server_title is
        called with untrusted input, arbitrary JavaScript can be delivered
        to clients that visit the http URL for this server.
    
    CVE-2019-18348
    
        An issue was discovered in urllib2. CRLF injection is possible if
        the attacker controls a url parameter, as demonstrated by the
        first argument to urllib.request.urlopen with \r\n (specifically
        in the host component of a URL) followed by an HTTP header. This
        is similar to the CVE-2019-9740 query string issue and the
        CVE-2019-9947 path string issue
    
    CVE-2020-8492
    
        Python allows an HTTP server to conduct Regular Expression Denial
        of Service (ReDoS) attacks against a client because of
        urllib.request.AbstractBasicAuthHandler catastrophic backtracking.
    
    CVE-2020-14422
    
        Lib/ipaddress.py improperly computes hash values in the
        IPv4Interface and IPv6Interface classes, which might allow a
        remote attacker to cause a denial of service if an application is
        affected by the performance of a dictionary containing
        IPv4Interface or IPv6Interface objects, and this attacker can
        cause many dictionary entries to be created.
    
    For Debian 9 stretch, these problems have been fixed in version
    3.5.3-1+deb9u2.
    
    We recommend that you upgrade your python3.5 packages.
    
    For the detailed security status of python3.5 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/python3.5
    
    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS
    

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