File _patchinfo of Package patchinfo.4990

<patchinfo incident="4990">
  <issue id="1044947" tracker="bnc">CVE-2017-7508, CVE-2017-7520, CVE-2017-7521, CVE-2017-7522: openvpn: upcoming security release</issue>
  <issue id="2017-7520" tracker="cve" />
  <issue id="2017-7521" tracker="cve" />
  <issue id="2017-7508" tracker="cve" />
  <category>security</category>
  <rating>important</rating>
  <packager>psimons</packager>
  <description>This update for openvpn 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]
</description>
  <summary>Security update for openvpn</summary>
</patchinfo>