Debian: Security Advisory (DSA-3900-1)

# SPDX-FileCopyrightText: 2017 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.703900");
  script_cve_id("CVE-2017-7508", "CVE-2017-7520", "CVE-2017-7521");
  script_tag(name:"creation_date", value:"2017-06-26 22:00:00 +0000 (Mon, 26 Jun 2017)");
  script_version("2024-02-02T05:06:06+0000");
  script_tag(name:"last_modification", value:"2024-02-02 05:06:06 +0000 (Fri, 02 Feb 2024)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2017-06-30 14:28:46 +0000 (Fri, 30 Jun 2017)");

  script_name("Debian: Security Advisory (DSA-3900-1)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("Debian Local Security Checks");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("ssh/login/debian_linux", "ssh/login/packages", re:"ssh/login/release=DEB(8|9)");

  script_xref(name:"Advisory-ID", value:"DSA-3900-1");
  script_xref(name:"URL", value:"https://www.debian.org/security/2017/DSA-3900-1");
  script_xref(name:"URL", value:"https://security-tracker.debian.org/tracker/DSA-3900");

  script_tag(name:"summary", value:"The remote host is missing an update for the Debian 'openvpn' package(s) announced via the DSA-3900-1 advisory.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable package version is present on the target host.");

  script_tag(name:"insight", value:"Several issues were discovered in openvpn, a virtual private network application.

CVE-2017-7479

It was discovered that openvpn did not properly handle the rollover of packet identifiers. This would allow an authenticated remote attacker to cause a denial-of-service via application crash.

CVE-2017-7508

Guido Vranken discovered that openvpn did not properly handle specific malformed IPv6 packets. This would allow a remote attacker to cause a denial-of-service via application crash.

CVE-2017-7520

Guido Vranken discovered that openvpn did not properly handle clients connecting to an HTTP proxy with NTLMv2 authentication. This would allow a remote attacker to cause a denial-of-service via application crash, or potentially leak sensitive information like the user's proxy password.

CVE-2017-7521

Guido Vranken discovered that openvpn did not properly handle some x509 extensions. This would allow a remote attacker to cause a denial-of-service via application crash.

For the oldstable distribution (jessie), these problems have been fixed in version 2.3.4-5+deb8u2.

For the stable distribution (stretch), these problems have been fixed in version 2.4.0-6+deb9u1.

For the testing distribution (buster), these problems have been fixed in version 2.4.3-1.

For the unstable distribution (sid), these problems have been fixed in version 2.4.3-1.

We recommend that you upgrade your openvpn packages.");

  script_tag(name:"affected", value:"'openvpn' package(s) on Debian 8, Debian 9.");

  script_tag(name:"solution", value:"Please install the updated package(s).");

  script_tag(name:"solution_type", value:"VendorFix");
  script_tag(name:"qod_type", value:"package");

  exit(0);
}

include("revisions-lib.inc");
include("pkg-lib-deb.inc");

release = dpkg_get_ssh_release();
if(!release)
  exit(0);

res = "";
report = "";

if(release == "DEB8") {

  if(!isnull(res = isdpkgvuln(pkg:"openvpn", ver:"2.3.4-5+deb8u2", rls:"DEB8"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

if(release == "DEB9") {

  if(!isnull(res = isdpkgvuln(pkg:"openvpn", ver:"2.4.0-6+deb9u1", rls:"DEB9"))) {
    report += res;
  }

  if(report != "") {
    security_message(data:report);
  } else if(__pkg_match) {
    exit(99);
  }
  exit(0);
}

exit(0);