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Linux Distros Unpatched Vulnerability : CVE-2016-20013

🗓️ 03 Sep 2025 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com

Linux hosts with sha256crypt or sha512crypt up to 0.6 suffer DoS due to password length (CVE-2016-20013).

Related
Refs
Code
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: Astronomer with IBM is vulnerable to several vulnerabilities
4 Sep 202522:39
–ibm
IBM Security Bulletins		Security Bulletin: Astronomer with IBM is vulnerable to several issues due to open source packages
28 Nov 202519:13
–ibm
Circl		CVE-2016-20013
19 Feb 202207:38
–circl
CNNVD		Sha256 Crypt和Sha512 Crypt 安全漏洞
19 Feb 202200:00
–cnnvd
CVE		CVE-2016-20013
19 Feb 202204:17
–cve
Cvelist		CVE-2016-20013
19 Feb 202204:17
–cvelist
EUVD		EUVD-2016-3101
7 Oct 202500:30
–euvd
NVD		CVE-2016-20013
19 Feb 202205:15
–nvd
OSV		CVE-2016-20013
19 Feb 202205:15
–osv
OSV		UBUNTU-CVE-2016-20013
19 Feb 202205:15
–osv
Rows per page
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##
# (C) Tenable, Inc.
##

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  - sha256crypt and sha512crypt through 0.6 allow attackers to cause a denial of service (CPU consumption)
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    (CVE-2016-20013)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/Debian/dpkg-l"))) audit(AUDIT_PACKAGE_LIST_MISSING);

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          {"reference": "libc6-mipsn32"},
          {"reference": "libc6-powerpc"},
          {"reference": "libc6-ppc64"},
          {"reference": "libc6-prof"},
          {"reference": "libc6-s390"},
          {"reference": "libc6-sparc"},
          {"reference": "libc6-sparc64"},
          {"reference": "libc6-udeb"},
          {"reference": "libc6-x32"},
          {"reference": "libc6-xen"},
          {"reference": "libc6.1"},
          {"reference": "libc6.1-alphaev67"},
          {"reference": "libc6.1-dbg"},
          {"reference": "libc6.1-dev"},
          {"reference": "libc6.1-udeb"},
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-simpleifp-dev"},
          {"reference": "libsss-simpleifp0"},
          {"reference": "libsss-sudo"},
          {"reference": "locales"},
          {"reference": "locales-all"},
          {"reference": "nscd"},
          {"reference": "pxelinux"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"},
          {"reference": "syslinux"},
          {"reference": "syslinux-common"},
          {"reference": "syslinux-efi"},
          {"reference": "syslinux-utils"},
          {"reference": "zabbix"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "dietlibc"},
          {"reference": "extlinux"},
          {"reference": "glibc-doc"},
          {"reference": "glibc-source"},
          {"reference": "isolinux"},
          {"reference": "libc-bin"},
          {"reference": "libc-dev-bin"},
          {"reference": "libc-devtools"},
          {"reference": "libc-l10n"},
          {"reference": "libc0.3"},
          {"reference": "libc0.3-dbg"},
          {"reference": "libc0.3-dev"},
          {"reference": "libc0.3-udeb"},
          {"reference": "libc6"},
          {"reference": "libc6-amd64"},
          {"reference": "libc6-dbg"},
          {"reference": "libc6-dev"},
          {"reference": "libc6-dev-amd64"},
          {"reference": "libc6-dev-i386"},
          {"reference": "libc6-dev-mips32"},
          {"reference": "libc6-dev-mips64"},
          {"reference": "libc6-dev-mipsn32"},
          {"reference": "libc6-dev-powerpc"},
          {"reference": "libc6-dev-ppc64"},
          {"reference": "libc6-dev-s390"},
          {"reference": "libc6-dev-sparc"},
          {"reference": "libc6-dev-sparc64"},
          {"reference": "libc6-dev-x32"},
          {"reference": "libc6-i386"},
          {"reference": "libc6-mips32"},
          {"reference": "libc6-mips64"},
          {"reference": "libc6-mipsn32"},
          {"reference": "libc6-powerpc"},
          {"reference": "libc6-ppc64"},
          {"reference": "libc6-s390"},
          {"reference": "libc6-sparc"},
          {"reference": "libc6-sparc64"},
          {"reference": "libc6-udeb"},
          {"reference": "libc6-x32"},
          {"reference": "libc6.1"},
          {"reference": "libc6.1-dbg"},
          {"reference": "libc6.1-dev"},
          {"reference": "libc6.1-udeb"},
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0t64"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-sudo"},
          {"reference": "locales"},
          {"reference": "locales-all"},
          {"reference": "nscd"},
          {"reference": "pxelinux"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-passkey"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"},
          {"reference": "syslinux"},
          {"reference": "syslinux-common"},
          {"reference": "syslinux-efi"},
          {"reference": "syslinux-utils"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.04",
        "pkgs": [
          {"reference": "dietlibc"},
          {"reference": "extlinux"},
          {"reference": "glibc-doc"},
          {"reference": "glibc-source"},
          {"reference": "isolinux"},
          {"reference": "libc-bin"},
          {"reference": "libc-dev-bin"},
          {"reference": "libc-devtools"},
          {"reference": "libc-l10n"},
          {"reference": "libc0.3"},
          {"reference": "libc0.3-dbg"},
          {"reference": "libc0.3-dev"},
          {"reference": "libc0.3-udeb"},
          {"reference": "libc6"},
          {"reference": "libc6-amd64"},
          {"reference": "libc6-dbg"},
          {"reference": "libc6-dev"},
          {"reference": "libc6-dev-amd64"},
          {"reference": "libc6-dev-i386"},
          {"reference": "libc6-dev-mips32"},
          {"reference": "libc6-dev-mips64"},
          {"reference": "libc6-dev-mipsn32"},
          {"reference": "libc6-dev-powerpc"},
          {"reference": "libc6-dev-ppc64"},
          {"reference": "libc6-dev-s390"},
          {"reference": "libc6-dev-sparc"},
          {"reference": "libc6-dev-sparc64"},
          {"reference": "libc6-dev-x32"},
          {"reference": "libc6-i386"},
          {"reference": "libc6-mips32"},
          {"reference": "libc6-mips64"},
          {"reference": "libc6-mipsn32"},
          {"reference": "libc6-powerpc"},
          {"reference": "libc6-ppc64"},
          {"reference": "libc6-s390"},
          {"reference": "libc6-sparc"},
          {"reference": "libc6-sparc64"},
          {"reference": "libc6-udeb"},
          {"reference": "libc6-x32"},
          {"reference": "libc6.1"},
          {"reference": "libc6.1-dbg"},
          {"reference": "libc6.1-dev"},
          {"reference": "libc6.1-udeb"},
          {"reference": "libipa-hbac-dev"},
          {"reference": "libipa-hbac0t64"},
          {"reference": "libnss-sss"},
          {"reference": "libpam-sss"},
          {"reference": "libsss-certmap-dev"},
          {"reference": "libsss-certmap0"},
          {"reference": "libsss-idmap-dev"},
          {"reference": "libsss-idmap0"},
          {"reference": "libsss-nss-idmap-dev"},
          {"reference": "libsss-nss-idmap0"},
          {"reference": "libsss-sudo"},
          {"reference": "locales"},
          {"reference": "locales-all"},
          {"reference": "nscd"},
          {"reference": "pxelinux"},
          {"reference": "python3-libipa-hbac"},
          {"reference": "python3-libsss-nss-idmap"},
          {"reference": "python3-sss"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-ad-common"},
          {"reference": "sssd-common"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-passkey"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"},
          {"reference": "syslinux"},
          {"reference": "syslinux-common"},
          {"reference": "syslinux-efi"},
          {"reference": "syslinux-utils"},
          {"reference": "zabbix"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}

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30 Jan 2026 00:00Current
7.2High risk
Vulners AI Score7.2
CVSS 25
CVSS 3.17.5
EPSS0.00307
linuxdenial of servicepassword lengthsha256cryptsha512cryptcve 2016 20013
0