Security update for openvpn-openssl1

Announcement ID: SUSE-SU-2017:1718-1
Rating: important
CVSS scores:
  • CVE-2017-7478 ( NVD ): 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • CVE-2017-7479 ( NVD ): 6.5 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  • CVE-2017-7508 ( SUSE ): 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  • CVE-2017-7508 ( NVD ): 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • CVE-2017-7520 ( SUSE ): 8.2 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
  • CVE-2017-7520 ( NVD ): 7.4 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
  • CVE-2017-7521 ( SUSE ): 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • CVE-2017-7521 ( NVD ): 5.9 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products:
  • Security Module for SUSE Linux Enterprise 11 11-SP3

An update that solves five vulnerabilities and has one security fix can now be installed.


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, CVE-2017-7508]

  • 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 update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Alternatively you can run the command listed for your product:

  • Security Module for SUSE Linux Enterprise 11 11-SP3
    zypper in -t patch secsp3-openvpn-openssl1-13182=1

Package List:

  • Security Module for SUSE Linux Enterprise 11 11-SP3 (s390x x86_64 i586 ppc64 ia64)
    • openvpn-openssl1-2.3.2-0.9.1
    • openvpn-openssl1-down-root-plugin-2.3.2-0.9.1