svn commit: r512325 - head/security/vuxml
Tijl Coosemans
tijl at FreeBSD.org
Thu Sep 19 09:40:38 UTC 2019
Author: tijl
Date: Thu Sep 19 09:40:37 2019
New Revision: 512325
URL: https://svnweb.freebsd.org/changeset/ports/512325
Log:
Document Mbed TLS side channel attack on deterministic ECDSA.
Security: https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2019-10
Modified:
head/security/vuxml/vuln.xml
Modified: head/security/vuxml/vuln.xml
==============================================================================
--- head/security/vuxml/vuln.xml Thu Sep 19 09:39:56 2019 (r512324)
+++ head/security/vuxml/vuln.xml Thu Sep 19 09:40:37 2019 (r512325)
@@ -58,6 +58,42 @@ Notes:
* Do not forget port variants (linux-f10-libxml2, libxml2, etc.)
-->
<vuxml xmlns="http://www.vuxml.org/apps/vuxml-1">
+ <vuln vid="1c948fd3-dac0-11e9-81b2-0011d823eebd">
+ <topic>Mbed TLS -- Side channel attack on deterministic ECDSA</topic>
+ <affects>
+ <package>
+ <name>mbedtls</name>
+ <range><lt>2.16.3</lt></range>
+ </package>
+ </affects>
+ <description>
+ <body xmlns="http://www.w3.org/1999/xhtml">
+ <p>Janos Follath reports:</p>
+ <blockquote cite="https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2019-10">
+ <p>Mbed TLS does not have a constant-time/constant-trace arithmetic
+ library and uses blinding to protect against side channel
+ attacks.</p>
+ <p>In the ECDSA signature routine previous Mbed TLS versions used the
+ same RNG object for generating the ephemeral key pair and for
+ generating the blinding values. The deterministic ECDSA function
+ reused this by passing the RNG object created from the private key
+ and the message to be signed as prescribed by RFC 6979. This meant
+ that the same RNG object was used whenever the same message was
+ signed, rendering the blinding ineffective.</p>
+ <p>If the victim can be tricked to sign the same message repeatedly,
+ the private key may be recoverable through side channels.</p>
+ </blockquote>
+ </body>
+ </description>
+ <references>
+ <url>https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2019-10</url>
+ </references>
+ <dates>
+ <discovery>2019-09-06</discovery>
+ <entry>2019-09-19</entry>
+ </dates>
+ </vuln>
+
<vuln vid="55571619-454e-4769-b1e5-28354659e152">
<topic>bro -- invalid memory access or heap buffer over-read</topic>
<affects>
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