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AUSCERT External Security Bulletin Redistribution
node.js - multiple vulnerabilities
28 August 2018
AusCERT Security Bulletin Summary
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
CVE Names: CVE-2018-12115 CVE-2018-7166 CVE-2018-0732
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
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node.js -- multiple vulnerabilities
node < 10.9.0
node8 < 8.11.4
node6 < 6.14.4
VuXML ID 0904e81f-a89d-11e8-afbb-bc5ff4f77b71
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
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
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