CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:S/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
AI Score
Confidence
Low
EPSS
Percentile
69.4%
halfdog discovered an authentication bypass vulnerability in the Dovecot email server. Under some configurations Dovecot mistakenly trusts the username provided via authentication instead of failing. If there is no additional password verification, this allows the attacker to login as anyone else in the system. Only installations using :
are affected by this flaw.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DSA-4385. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('compat.inc');
if (description)
{
script_id(121603);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/06/24");
script_cve_id("CVE-2019-3814");
script_xref(name:"DSA", value:"4385");
script_name(english:"Debian DSA-4385-1 : dovecot - security update");
script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security-related update.");
script_set_attribute(attribute:"description", value:
"halfdog discovered an authentication bypass vulnerability in the
Dovecot email server. Under some configurations Dovecot mistakenly
trusts the username provided via authentication instead of failing. If
there is no additional password verification, this allows the attacker
to login as anyone else in the system. Only installations using :
- auth_ssl_require_client_cert = yes
- auth_ssl_username_from_cert = yes
are affected by this flaw.");
script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/dovecot");
script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/stretch/dovecot");
script_set_attribute(attribute:"see_also", value:"https://www.debian.org/security/2019/dsa-4385");
script_set_attribute(attribute:"solution", value:
"Upgrade the dovecot packages.
For the stable distribution (stretch), this problem has been fixed in
version 1:2.2.27-3+deb9u3.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:S/C:P/I:P/A:N");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-3814");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2019/03/27");
script_set_attribute(attribute:"patch_publication_date", value:"2019/02/05");
script_set_attribute(attribute:"plugin_publication_date", value:"2019/02/06");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:dovecot");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Debian Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2019-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");
exit(0);
}
include("audit.inc");
include("debian_package.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (deb_check(release:"9.0", prefix:"dovecot-core", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-dbg", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-dev", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-gssapi", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-imapd", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-ldap", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-lmtpd", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-lucene", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-managesieved", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-mysql", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-pgsql", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-pop3d", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-sieve", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-solr", reference:"1:2.2.27-3+deb9u3")) flag++;
if (deb_check(release:"9.0", prefix:"dovecot-sqlite", reference:"1:2.2.27-3+deb9u3")) flag++;
if (flag)
{
if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
else security_warning(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
CVSS2
Attack Vector
NETWORK
Attack Complexity
MEDIUM
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:M/Au:S/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N
AI Score
Confidence
Low
EPSS
Percentile
69.4%