Debian: Security Advisory (DLA-2695-1)

# 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("1.3.6.1.4.1.25623.1.0.892695");
  script_cve_id("CVE-2021-31870", "CVE-2021-31871", "CVE-2021-31872", "CVE-2021-31873");
  script_tag(name:"creation_date", value:"2021-06-29 03:00:14 +0000 (Tue, 29 Jun 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:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/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:"2021-05-11 16:33:18 +0000 (Tue, 11 May 2021)");

  script_name("Debian: Security Advisory (DLA-2695-1)");
  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-2695-1");
  script_xref(name:"URL", value:"https://www.debian.org/lts/security/2021/DLA-2695-1");
  script_xref(name:"URL", value:"https://security-tracker.debian.org/tracker/klibc");
  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 'klibc' package(s) announced via the DLA-2695-1 advisory.");

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

  script_tag(name:"insight", value:"Several vulnerabilities have been discovered in klibc. Depending on how klibc is used, these could lead to the execution of arbitrary code, privilege escalation, or denial of service.

Thanks to Microsoft Vulnerability Research for reporting the heap bugs and going some of the way to identifying the cpio bugs.

CVE-2021-31870

Multiplication in the calloc() function may result in an integer overflow and a subsequent heap buffer overflow.

CVE-2021-31871

An integer overflow in the cpio command may result in a NULL pointer dereference.

CVE-2021-31872

Multiple possible integer overflows in the cpio command on 32-bit systems may result in a buffer overflow or other security impact.

CVE-2021-31873

Additions in malloc() function may result in integer overflow and subsequent heap buffer overflow.

For Debian 9 stretch, these problems have been fixed in version 2.0.4-9+deb9u1.

We recommend that you upgrade your klibc packages.

For the detailed security status of klibc 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:"'klibc' 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:"klibc-utils", ver:"2.0.4-9+deb9u1", rls:"DEB9"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"libklibc", ver:"2.0.4-9+deb9u1", rls:"DEB9"))) {
    report += res;
  }

  if(!isnull(res = isdpkgvuln(pkg:"libklibc-dev", ver:"2.0.4-9+deb9u1", rls:"DEB9"))) {
    report += res;
  }

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

exit(0);