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             AUSCERT External Security Bulletin Redistribution

                    node.js - multiple vulnerabilities
                              28 August 2018


        AusCERT Security Bulletin Summary

Product:           Node.js
Publisher:         FreeBSD
Operating System:  FreeBSD
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
                   Access Privileged Data          -- Remote/Unauthenticated
                   Denial of Service               -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-12115 CVE-2018-7166 CVE-2018-0732

Reference:         ESB-2018.2495

Original Bulletin: 

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than FreeBSD. It is recommended that administrators
         running check for an updated version of the software for their 
         operating system.

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node.js -- multiple vulnerabilities

Affected packages
  node  < 10.9.0
  node8 < 8.11.4
  node6 < 6.14.4


VuXML ID  0904e81f-a89d-11e8-afbb-bc5ff4f77b71
Discovery 2018-08-16
Entry     2018-08-25

Node.js reports:

    OpenSSL: Client DoS due to large DH parameter

    This fixes a potential denial of service (DoS) attack against client
    connections by a malicious server. During a TLS communication handshake,
    where both client and server agree to use a cipher-suite using DH or DHE
    (Diffie-Hellman, in both ephemeral and non-ephemeral modes), a malicious
    server can send a very large prime value to the client. Because this has
    been unbounded in OpenSSL, the client can be forced to spend an
    unreasonably long period of time to generate a key, potentially causing a
    denial of service.

    OpenSSL: ECDSA key extraction via local side-channel

    Attackers with access to observe cache-timing may be able to extract DSA or
    ECDSA private keys by causing the victim to create several signatures and
    watching responses. This flaw does not have a CVE due to OpenSSL policy to
    not assign itself CVEs for local-only vulnerabilities that are more
    academic than practical. This vulnerability was discovered by Keegan Ryan
    at NCC Group and impacts many cryptographic libraries including OpenSSL.

    Unintentional exposure of uninitialized memory

    Only Node.js 10 is impacted by this flaw.

    Node.js TSC member Nikita Skovoroda discovered an argument processing flaw
    that causes Buffer.alloc() to return uninitialized memory. This method is
    intended to be safe and only return initialized, or cleared, memory. The
    third argument specifying encoding can be passed as a number, this is
    misinterpreted by Buffer's internal "fill" method as the start to a fill
    operation. This flaw may be abused where Buffer.alloc() arguments are
    derived from user input to return uncleared memory blocks that may contain
    sensitive information.

    Out of bounds (OOB) write

    Node.js TSC member Nikita Skovoroda discovered an OOB write in Buffer that
    can be used to write to memory outside of a Buffer's memory space. This can
    corrupt unrelated Buffer objects or cause the Node.js process to crash.

    When used with UCS-2 encoding (recognized by Node.js under the names
    'ucs2', 'ucs-2', 'utf16le' and 'utf-16le'), Buffer#write() can be abused to
    write outside of the bounds of a single Buffer. Writes that start from the
    second-to-last position of a buffer cause a miscalculation of the maximum
    length of the input bytes to be written.


CVE Name CVE-2018-0732
CVE Name CVE-2018-12115
CVE Name CVE-2018-7166
URL      https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/

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