Vulnerabilities > CVE-2019-0064 - Improper Input Validation vulnerability in Juniper Junos 18.2/18.4/19.2
Attack vector
NETWORK Attack complexity
MEDIUM Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
PARTIAL Summary
On SRX5000 Series devices, if 'set security zones security-zone <zone> tcp-rst' is configured, the flowd process may crash when a specific TCP packet is received by the device and triggers a new session. The process restarts automatically. However, receipt of a constant stream of these TCP packets may result in an extended Denial of Service (DoS) condition on the device. This issue affects Juniper Networks Junos OS: 18.2R3 on SRX 5000 Series; 18.4R2 on SRX 5000 Series; 19.2R1 on SRX 5000 Series.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| OS | 3 | |
| Hardware | 3 |
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Buffer Overflow via Environment Variables This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
Nessus
NASL family Junos Local Security Checks NASL id JUNIPER_JSA10970.NASL description The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the JSA10970 advisory. Note that Nessus has not tested for this issue but has instead relied only on the application last seen 2020-06-01 modified 2020-06-02 plugin id 133303 published 2020-01-29 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/133303 title Juniper JSA10970 code # # (C) Tenable Network Security, Inc. # include('compat.inc'); if (description) { script_id(133303); script_version("1.1"); script_cvs_date("Date: 2020/01/29"); script_cve_id( "CVE-2019-0047", "CVE-2019-0050", "CVE-2019-0054", "CVE-2019-0055", "CVE-2019-0057", "CVE-2019-0058", "CVE-2019-0059", "CVE-2019-0060", "CVE-2019-0062", "CVE-2019-0063", "CVE-2019-0064", "CVE-2019-0066", "CVE-2019-0067", "CVE-2019-0068", "CVE-2019-0073", "CVE-2019-0075" ); script_xref(name:"IAVA", value:"2019-A-0388"); script_name(english:"Juniper JSA10970"); script_summary(english:"Checks the Junos version and build date."); script_set_attribute(attribute:"synopsis", value: "The remote device is missing a vendor-supplied security patch."); script_set_attribute(attribute:"description", value: "The version of tested product installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the JSA10970 advisory. Note that Nessus has not tested for this issue but has instead relied only on the application's self- reported version number."); script_set_attribute(attribute:"see_also", value:"https://kb.juniper.net/KB16613"); script_set_attribute(attribute:"see_also", value:"https://kb.juniper.net/KB16765"); script_set_attribute(attribute:"see_also", value:"https://kb.juniper.net/KB16446"); script_set_attribute(attribute:"see_also", value:"https://kb.juniper.net/JSA10970"); script_set_attribute(attribute:"solution", value: "Apply the relevant Junos software release referenced in Juniper advisory JSA10970"); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-0047"); script_set_attribute(attribute:"vuln_publication_date", value:"2020/01/28"); script_set_attribute(attribute:"patch_publication_date", value:"2020/01/28"); script_set_attribute(attribute:"plugin_publication_date", value:"2020/01/29"); script_set_attribute(attribute:"plugin_type", value:"combined"); script_set_attribute(attribute:"cpe", value:"cpe:/o:juniper:junos"); script_set_attribute(attribute:"stig_severity", value:"I"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Junos Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("junos_version.nasl"); script_require_keys("Host/Juniper/JUNOS/Version", "Host/Juniper/model"); exit(0); } include('audit.inc'); include('junos.inc'); include('misc_func.inc'); ver = get_kb_item_or_exit('Host/Juniper/JUNOS/Version'); model = get_kb_item_or_exit('Host/Juniper/model'); fixes = make_array(); fixes['12.1X46'] = '12.1X46-D86'; fixes['12.3'] = '12.3R12-S13'; fixes['12.3X48'] = '12.3X48-D80'; fixes['14.1X53'] = '14.1X53-D51'; if (ver =~ "^15\.1F") fixes['15.1F'] = '15.1F6-S13'; else fixes['15.1'] = '15.1R7-S4'; fixes['15.1X49'] = '15.1X49-D171'; fixes['15.1X53'] = '15.1X53-D69'; fixes['16.1'] = '16.1R7-S5'; fixes['16.2'] = '16.2R2-S9'; fixes['17.1'] = '17.1R3'; if (ver =~ "^17\.2R1") fixes['17.2'] = '17.2R1-S8'; else if (ver =~ "^17\.2R2") fixes['17.2'] = '17.2R2-S7'; else if (ver =~ "^17\.2R3") fixes['17.2'] = '17.2R3-S1'; fixes['17.3'] = '17.3R3-S6'; if (ver =~ "^17\.4R1") fixes['17.4'] = '17.4R1-S7'; else if (ver =~ "^17\.4R2") fixes['17.4'] = '17.4R2-S4'; else fixes['17.4'] = '17.4R3'; fixes['18.1'] = '18.1R3-S5'; if (ver =~ "^18\.2R1") fixes['18.2'] = '18.2R1-S5'; else if (ver =~ "^18\.2R2") fixes['18.2'] = '18.2R2-S3'; else fixes['18.2'] = '18.2R3'; if (ver =~ "^18\.3R1") fixes['18.3'] = '18.3R1-S3'; else if (ver =~ "^18\.3R2") fixes['18.3'] = '18.3R2'; else if (ver =~ "^18\.3R3") fixes['18.3'] = '18.3R3'; if (ver =~ "^18\.4R1") fixes['18.4'] = '18.4R1-S2'; else fixes['18.4'] = '18.4R2'; fix = check_junos(ver:ver, fixes:fixes, exit_on_fail:TRUE); report = get_report(ver:ver, fix:fix); security_report_v4(severity:SECURITY_WARNING, port:0, extra:report);NASL family Junos Local Security Checks NASL id JUNIPER_JSA10963.NASL description According to its self-reported version number, the remote Juniper Junos device is affected by a denial of service (DoS) vulnerability in the flowd process on SRX 5000 devices when last seen 2020-03-18 modified 2019-11-04 plugin id 130466 published 2019-11-04 reporter This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/130466 title Junos OS: flowd DoS (JSA10963) code #TRUSTED 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 # # (C) Tenable Network Security, Inc. # include('compat.inc'); if (description) { script_id(130466); script_version("1.2"); script_set_attribute(attribute:"plugin_modification_date", value:"2019/11/04"); script_cve_id("CVE-2019-0064"); script_xref(name:"JSA", value:"JSA10963"); script_xref(name:"IAVA", value:"2019-A-0388"); script_name(english:"Junos OS: flowd DoS (JSA10963)"); script_set_attribute(attribute:"synopsis", value: "The remote device is missing a vendor-supplied security patch."); script_set_attribute(attribute:"description", value: "According to its self-reported version number, the remote Juniper Junos device is affected by a denial of service (DoS) vulnerability in the flowd process on SRX 5000 devices when 'set security zones security-zone <zone> tcp-rst' is configured. An unauthenticated, remote attacker can send a crafted TCP packet to crash the flowd process and trigger a new session. Repeated crashes of the flowd daemon can result in an extended DoS condition. Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number."); script_set_attribute(attribute:"see_also", value:"https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10963"); script_set_attribute(attribute:"solution", value: "Apply the relevant Junos software release referenced in Juniper advisory JSA10963."); script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-0064"); script_set_attribute(attribute:"vuln_publication_date", value:"2019/10/09"); script_set_attribute(attribute:"patch_publication_date", value:"2019/10/09"); script_set_attribute(attribute:"plugin_publication_date", value:"2019/11/04"); script_set_attribute(attribute:"plugin_type", value:"combined"); script_set_attribute(attribute:"cpe", value:"cpe:/o:juniper:junos"); script_set_attribute(attribute:"stig_severity", value:"I"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"Junos Local Security Checks"); script_dependencies("junos_version.nasl"); script_require_keys("Host/Juniper/JUNOS/Version", "Host/Juniper/model"); exit(0); } include('audit.inc'); include('junos.inc'); include('junos_kb_cmd_func.inc'); include('misc_func.inc'); ver = get_kb_item_or_exit('Host/Juniper/JUNOS/Version'); model = get_kb_item_or_exit('Host/Juniper/model'); # SRX5000 Series if ( 'SRX5' >!< model) audit(AUDIT_INST_VER_NOT_VULN, 'Junos', ver); fixes = make_array(); fixes['18.2'] = '18.2R3-S1'; fixes['18.4'] = '18.4R2-S1'; fixes['19.2'] = '19.2R1-S1'; fixes['19.3'] = '19.3R1'; fix = check_junos(ver:ver, fixes:fixes, exit_on_fail:TRUE); # If 'set security zones security-zone <zone> tcp-rst' isn't configured, audit out. override = TRUE; buf = junos_command_kb_item(cmd:'show configuration | display set'); if (buf) { override = FALSE; pattern = "^set security zones security-zone .* tcp-rst"; if (!junos_check_config(buf:buf, pattern:pattern)) audit(AUDIT_HOST_NOT, 'vulnerable as it does not appear to have a security zone with tcp-rst enabled.'); } junos_report(ver:ver, fix:fix, override:override, severity:SECURITY_WARNING);