Security update for openvpn-openssl1

SUSE Security Update: Security update for openvpn-openssl1
Announcement ID: SUSE-SU-2017:1718-1
Rating: important
References: #1038709 #1038711 #1038713 #1044947 #959511 #988522
Affected Products:
  • SUSE Linux Enterprise Server 11-SECURITY

  • An update that solves 5 vulnerabilities and has one errata is now available.


    This update for openvpn-openssl1 fixes the following issues:

    - Some parts of the certificate-parsing code did not always clear all
    allocated memory. This would have allowed clients to leak a few bytes of
    memory for each connection attempt, thereby facilitating a (quite
    inefficient) DoS attack on the server. [bsc#1044947, CVE-2017-7521]

    - The ASN1 parsing code contained a bug that could have resulted in some
    buffers being free()d twice, and this issue could have potentially been
    triggered remotely by a VPN peer. [bsc#1044947, CVE-2017-7521]

    - If clients used a HTTP proxy with NTLM authentication, a
    man-in-the-middle attacker between client and proxy could cause the
    client to crash or disclose at most 96 bytes of stack memory. The
    disclosed stack memory was likely to contain the proxy password. If the
    proxy password had not been reused, this was unlikely to compromise the
    security of the OpenVPN tunnel itself. Clients who did not use the
    --http-proxy option with ntlm2 authentication were not affected.
    [bsc#1044947, CVE-2017-7520]

    - It was possible to trigger an assertion by sending a malformed IPv6
    packet. That issue could have been abused to remotely shutdown an
    openvpn server or client, if IPv6 and --mssfix were enabled and if the
    IPv6 networks used inside the VPN were known. [bsc#1044947,

    - The installed sample configuration file was updated to comply to FIPS
    requirements. [bsc#988522]

    - Remedy large latencies on the openVPN server during authentication
    process. [bsc#959511]

    - Fix potential denial-of-service attacks found during independent audits.
    [bsc#1038713, bsc#1038709, CVE-2017-7478, bsc#1038711, CVE-2017-7479]

    Patch Instructions:

    To install this SUSE Security Update use YaST online_update.
    Alternatively you can run the command listed for your product:

    • SUSE Linux Enterprise Server 11-SECURITY:
      zypper in -t patch secsp3-openvpn-openssl1-13182=1

    To bring your system up-to-date, use "zypper patch".

    Package List:

    • SUSE Linux Enterprise Server 11-SECURITY (i586 ia64 ppc64 s390x x86_64):
      • openvpn-openssl1-2.3.2-0.9.1
      • openvpn-openssl1-down-root-plugin-2.3.2-0.9.1