Date: Thu, 19 Sep 2019 09:40:37 +0000 (UTC) From: Tijl Coosemans <tijl@FreeBSD.org> To: ports-committers@freebsd.org, svn-ports-all@freebsd.org, svn-ports-head@freebsd.org Subject: svn commit: r512325 - head/security/vuxml Message-ID: <201909190940.x8J9ebte033790@repo.freebsd.org>
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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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