CVE-2021-0268

Junos OS: J-Web has an Improper Neutralization of CRLF Sequences in its HTTP Headers which allows an attacker to carry out multiple types of attacks.

Severity Score

9.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') weakness in J-web of Juniper Networks Junos OS leads to buffer overflows, segment faults, or other impacts, which allows an attacker to modify the integrity of the device and exfiltration information from the device without authentication. The weakness can be exploited to facilitate cross-site scripting (XSS), cookie manipulation (modifying session cookies, stealing cookies) and more. This weakness can also be exploited by directing a user to a seemingly legitimate link from the affected site. The attacker requires no special access or permissions to the device to carry out such attacks. This issue affects: Juniper Networks Junos OS: 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S5; 18.3 versions prior to 18.3R2-S4, 18.3R3-S3; 18.4 versions prior to 18.4R2-S5, 18.4R3-S3; 19.1 versions prior to 19.1R2-S2, 19.1R3-S2; 19.2 versions prior to 19.2R1-S5, 19.2R2; 19.3 versions prior to 19.3R3; 19.4 versions prior to 19.4R1-S3, 19.4R2, 19.4R3; 20.1 versions prior to 20.1R1-S2, 20.1R2. This issue does not affect Juniper Networks Junos OS versions prior to 18.1R1.

Una Neutralización Inapropiada de las Secuencias CRLF en una debilidad de los Encabezados HTTP (''HTTP Response Splitting") en J-web del Sistema Operativo Juniper Networks Junos conlleva a unos desbordamientos de búfer, fallos de segmento u otros impactos, permitiendo a un atacante modificar la integridad del dispositivo y información de exfiltración del dispositivo sin autenticación. La debilidad puede ser explotada para facilitar el ataque de tipo cross-site scripting (XSS), la manipulación de cookies (modificación de cookies de sesión, robo de cookies) y más. Esta debilidad también puede ser explotada al direccionar a un usuario hacia un enlace aparentemente legítimo del sitio afectado. El atacante no requiere acceso o permisos especiales al dispositivo para llevar a cabo tales ataques. Este problema afecta a: Juniper Networks Junos OS: versiones 18.1 anteriores a 18.1R3-S11; versiones 18.2 anteriores a 18.2R3-S5; versiones 18.3 anteriores a 18.3R2-S4, 18.3R3-S3; versiones 18. 4 anteriores a 18.4R2-S5, 18.4R3-S3; versiones 19.1 anteriores a 19.1R2-S2, 19.1R3-S2; versiones 19.2 anteriores a 19.2R1-S5, 19.2R2; versiones 19.3 anteriores a 19.3R3; versiones 19.4 anteriores a 19.4R1-S3, 19.4R2, 19.4R3; versiones 20.1 anteriores a 20.1R1-S2, 20.1R2. Este problema no afecta a las versiones de Juniper Networks Junos OS versiones anteriores a 18.1R1

*Credits: The Juniper SIRT wishes to thank Luca Ercoli for responsibly reporting one of the issues resolved in this update.

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-10-27 CVE Reserved
2021-04-22 CVE Published
2024-01-06 EPSS Updated
2024-09-17 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://kb.juniper.net/JSA11159	2022-08-05

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r2-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r2-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3-s10		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3-s6		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3-s7		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3-s8		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.1 Search vendor "Juniper" for product "Junos" and version "18.1"		r3-s9		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r1-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r1-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r1-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r2-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r2-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r2-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r2-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r2-s6		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r2-s7		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r3-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r3-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r3-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.2 Search vendor "Juniper" for product "Junos" and version "18.2"		r3-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r1-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r1-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r1-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r1-s6		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r2-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r2-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r3-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.3 Search vendor "Juniper" for product "Junos" and version "18.3"		r3-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s6		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r1-s7		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r2-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r3-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				18.4 Search vendor "Juniper" for product "Junos" and version "18.4"		r3-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r1-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.1 Search vendor "Juniper" for product "Junos" and version "19.1"		r3-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.2 Search vendor "Juniper" for product "Junos" and version "19.2"		r1-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		-		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2-s3		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2-s4		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.3 Search vendor "Juniper" for product "Junos" and version "19.3"		r2-s5		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r1-s1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				19.4 Search vendor "Juniper" for product "Junos" and version "19.4"		r1-s2		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.1 Search vendor "Juniper" for product "Junos" and version "20.1"		r1		Affected
Juniper Search vendor "Juniper"		Junos Search vendor "Juniper" for product "Junos"				20.1 Search vendor "Juniper" for product "Junos" and version "20.1"		r1-s1		Affected