Debian: Security Advisory (DLA-2588-1)

# SPDX-FileCopyrightText: 2021 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("1.3.6.1.4.1.25623.1.0.892588");
  script_cve_id("CVE-2021-20234", "CVE-2021-20235");
  script_tag(name:"creation_date", value:"2021-03-11 04:00:08 +0000 (Thu, 11 Mar 2021)");
  script_version("2024-02-02T05:06:07+0000");
  script_tag(name:"last_modification", value:"2024-02-02 05:06:07 +0000 (Fri, 02 Feb 2024)");
  script_tag(name:"cvss_base", value:"6.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-04-06 17:34:54 +0000 (Tue, 06 Apr 2021)");

  script_name("Debian: Security Advisory (DLA-2588-1)");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2021 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=DEB9");

  script_xref(name:"Advisory-ID", value:"DLA-2588-1");
  script_xref(name:"URL", value:"https://www.debian.org/lts/security/2021/DLA-2588-1");
  script_xref(name:"URL", value:"https://security-tracker.debian.org/tracker/zeromq3");
  script_xref(name:"URL", value:"https://wiki.debian.org/LTS");

  script_tag(name:"summary", value:"The remote host is missing an update for the Debian 'zeromq3' package(s) announced via the DLA-2588-1 advisory.");

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

  script_tag(name:"insight", value:"Two security issues have been detected in zeromq3.

CVE-2021-20234

Memory leak in client induced by malicious server(s) without CURVE/ZAP.

From issue description [1]. When a pipe processes a delimiter and is already not in active state but still has an unfinished message, the message is leaked.

CVE-2021-20235

Heap overflow when receiving malformed ZMTP v1 packets.

From issue description [2]. The static allocator was implemented to shrink its recorded size similarly to the shared allocator. But it does not need to, and it should not, because unlike the shared one the static allocator always uses a static buffer, with a size defined by the ZMQ_IN_BATCH_SIZE socket option (default 8192), so changing the size opens the library to heap overflows. The static allocator is used only with ZMTP v1 peers.

For Debian 9 stretch, these problems have been fixed in version 4.2.1-4+deb9u4.

We recommend that you upgrade your zeromq3 packages.

For the detailed security status of zeromq3 please refer to its security tracker page at: [link moved to references]

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: [link moved to references]");

  script_tag(name:"affected", value:"'zeromq3' package(s) on 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 == "DEB9") {

  if(!isnull(res = isdpkgvuln(pkg:"libzmq3-dev", ver:"4.2.1-4+deb9u4", rls:"DEB9"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"libzmq5", ver:"4.2.1-4+deb9u4", rls:"DEB9"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"libzmq5-dbg", ver:"4.2.1-4+deb9u4", rls:"DEB9"))) {
    report += res;
  }

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

exit(0);