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Debian: DSA-3255-1 Critical: Zeromq3 Protocol Downgrade Attack

It was discovered that libzmq, a lightweight messaging kernel, is susceptible to a protocol downgrade attack on sockets using the ZMTP v3 protocol. This could allow remote attackers to bypass ZMTP v3 security mechanisms by sending ZMTP v2 or earlier headers. . - ------------------------------------------------------------------------- Debian Security Advisory DSA-3255-1 This email address is being protected from spambots. You need JavaScript enabled to view it. http://www.debian.org/security/ Alessandro Ghedini May 10, 2015 http://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : zeromq3 CVE ID : none assigned yet Debian Bug : 784366 It was discovered that libzmq, a lightweight messaging kernel, is susceptible to a protocol downgrade attack on sockets using the ZMTP v3 protocol. This could allow remote attackers to bypass ZMTP v3 security mechanisms by sending ZMTP v2 or earlier headers. For the stable distribution (jessie), this problem has been fixed in version 4.0.5+dfsg-2+deb8u1. For the testing distribution (stretch), this problem has been fixed in version 4.0.5+dfsg-3. For the unstable distribution (sid), this problem has been fixed in version 4.0.5+dfsg-3. We recommend that you upgrade your zeromq3 packages. Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it. . Debian has released a critical security update for zeromq3 to mitigate protocol downgrade vulnerabilities that could potentially grant unauthorized remote access.. zeromq3 Security, Debian Update, Protocol Bypass, Messaging Kernel. . Severity: Critical. LinuxSecurity.com Team

May 10, 2015 •Critical Debian