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AUSCERT External Security Bulletin Redistribution
ESB-2021.0177.2
JSA11094 and JSA11114 - 2021-01 Security Bulletins: Junos OS
19 January 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Root Compromise -- Existing Account
Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-0223 CVE-2021-0222 CVE-2021-0204
Original Bulletin:
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11094
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11114
Revision History: January 19 2021: Vendor issues minor update
January 15 2021: Initial Release
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2021-01 Security Bulletin: Junos OS: Upon receipt of certain protocol packets with invalid payloads a self-propagating Denial of Service may occur. (CVE-2021-0222)
Article ID : JSA11094
Last Updated: 18 Jan 2021
Version : 3.0
Product Affected:
This issue affects Junos OS 14.1X53, 15.1, 16.1, 17.1, 17.2, 17.3, 17.4, 18.1,
18.2, 18.3, 18.4, 19.1, 19.2, 19.3. Affected platforms: EX2300, EX3400, EX4300,
EX4600, EX4650, QFX3500, QFX5100, QFX5110, QFX5120, QFX5200, QFX5210.
Problem:
A vulnerability in Juniper Networks Junos OS allows an attacker to cause a
Denial of Service (DoS) to the device by sending certain crafted protocol
packets from an adjacent device with invalid payloads to the device.
These crafted packets, which should be discarded, are instead replicated and
sent to the RE. Over time, a Denial of Service (DoS) occurs. Continued receipt
of these crafted protocol packets will cause an extended Denial of Service
(DoS) condition, which may cause wider traffic impact due to protocol flapping.
An indication of compromise is to check "monitor interface traffic" on the
ingress and egress port packet counts. For each ingress packet, two duplicate
packets are seen on egress.
This issue can be triggered by IPv4 and IPv6 packets.
This issue affects all traffic through the device.
This issue affects:
Juniper Networks Junos OS:
o 14.1X53 versions prior to 14.1X53-D53 on EX4300, QFX3500, QFX5100, EX4600;
o 15.1 versions prior to 15.1R7-S6 on EX4300, QFX3500, QFX5100, EX4600;
o 16.1 versions prior to 16.1R7-S7 on EX4300, QFX5100, EX4600;
o 17.1 versions prior to 17.1R2-S11 on EX4300, QFX5100, EX4600;
o 17.1 versions prior to 17.1R3-S2 on EX4300;
o 17.2 versions prior to 17.2R1-S9 on EX4300;
o 17.2 versions prior to 17.2R3-S3 on EX4300, QFX5100, EX4600, QFX5110,
QFX5200;
o 17.3 versions prior to 17.3R2-S5, 17.3R3-S7 on EX4300, QFX5100, EX4600,
QFX5110, QFX5200;
o 17.4 versions prior to 17.4R2-S9, 17.4R3 on EX4300, QFX5100, EX4600,
QFX5110, QFX5200;
o 18.1 versions prior to 18.1R3-S9 on EX4300, QFX5100, EX4600, QFX5110,
QFX5200, QFX5210, EX2300, EX3400;
o 18.2 versions prior to 18.2R2-S7 on EX4300;
o 18.2 versions prior to 18.2R3-S3 on EX4300, QFX5100, EX4600, QFX5110,
QFX5200, QFX5210, EX2300, EX3400;
o 18.3 versions prior to 18.3R2-S3, on EX4300;
o 18.3 versions prior to 18.3R1-S7, 18.3R3-S1 on EX4300, QFX5100, EX4600,
QFX5110, QFX5200, QFX5210, QFX5120, EX4650, EX2300, EX3400;
o 18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R3 on EX4300, QFX5100,
EX4600, QFX5110, QFX5200, QFX5210, QFX5120, EX4650, EX2300, EX3400;
o 19.1 versions prior to 19.1R1-S4, 19.1R2-S1, 19.1R3 on EX4300, QFX5100,
EX4600, QFX5110, QFX5200, QFX5210, QFX5120, EX4650, EX2300, EX3400;
o 19.2 versions prior to 19.2R1-S4, 19.2R2 on EX4300;
o 19.2 versions prior to 19.2R1-S3, 19.2R2 on QFX5100, EX4600, QFX5110,
QFX5200, QFX5210, QFX5120, EX4650, EX2300, EX3400;
o 19.3 versions prior to 19.3R2-S1, 19.3R3 on EX4300;
o 19.3 versions prior to 19.3R1-S1, 19.3R2, 19.3R3 on QFX5100, EX4600,
QFX5110, QFX5200, QFX5210, QFX5120, EX4650, EX2300, EX3400;
This issue was seen during production usage.
This issue has been assigned CVE-2021-0222 .
Solution:
The following software releases have been updated to resolve this specific
issue: 14.1X53-D53, 15.1R7-S6, 16.1R7-S7, 17.1R2-S11, 17.2R3-S3, 17.3R2-S5,
17.3R3-S7, 17.4R2-S9, 17.4R3, 18.1R3-S9, 18.2R3-S3, 18.4R1-S5, 18.4R2-S3,
18.4R3, 19.1R1-S4, 19.1R2-S1, 19.1R3, 19.2R2, 19.3R2-S1, 19.3R3, 19.4R1, and
all subsequent releases.
This issue is being tracked as 1472704 and 1471922 .
Workaround:
There are no available workarounds for this issue.
Implementation:
Software releases or updates are available for download at https://
www.juniper.net/support/downloads/ .
Modification History:
2021-01-13: Initial Publication.
2021-01-18: Additional letter 1 from 117 to 17 removed from version list.
CVSS Score:
7.4 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)
Severity Level:
High
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."
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2021-01 Security Bulletin: Junos OS: Multiple Local Privilege Escalation vulnerabilities in SUID binaries
Article ID : JSA11114
Last Updated: 14 Jan 2021
Version : 3.0
Product Affected:
This issue affects all versions of Junos OS.
Problem:
Multiple local privilege escalation vulnerabilities in Juniper Networks Junos
OS have been reported due to the setuid bit being enabled on multiple binaries.
These binaries will run as the owner of the executable (typically "root") and
inherit their privileges. Hence these binary files can be used to escalate
privileges to disclose sensitive information or execute arbitrary command as
root.
This issue affects Juniper Networks Junos OS:
o all versions prior to 15.1R7-S9;
o 17.3 versions prior to 17.3R3-S11;
o 17.4 versions prior to 17.4R2-S12, 17.4R3-S3;
o 18.1 versions prior to 18.1R3-S11;
o 18.2 versions prior to 18.2R3-S6;
o 18.3 versions prior to 18.3R3-S4;
o 18.4 versions prior to 18.4R2-S7, 18.4R3-S6;
o 19.1 versions prior to 19.1R2-S2, 19.1R3-S4;
o 19.2 versions prior to 19.2R1-S6, 19.2R3-S1;
o 19.3 versions prior to 19.3R3-S1;
o 19.4 versions prior to 19.4R2-S2, 19.4R3-S1;
o 20.1 versions prior to 20.1R1-S4, 20.1R2;
o 20.2 versions prior to 20.2R2.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was discovered during a external security research.
The following vulnerabilities have been resolved in the releases listed below:
CVE CVSS Summary
7.8 ( CVSS:3.1/AV:L/AC:L/ Junos OS: telnetd.real Local Privilege
CVE-2021-0223 PR:L/UI:N/S:U/C:H/I:H/A:H Escalation vulnerabilities in SUID
) binaries
7.8 ( CVSS:3.1/AV:L/AC:L/ Junos OS: dexp Local Privilege
CVE-2021-0204 PR:L/UI:N/S:U/C:H/I:H/A:H Escalation vulnerabilities in SUID
) binaries
Solution:
The following software releases have been updated to resolve these specific
issues: Junos OS 15.1R7-S9*, 17.3R3-S11*, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11,
18.2R3-S6, 18.3R3-S4, 18.4R2-S7, 18.4R3-S6, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6,
19.2R3-S1, 19.3R3-S1, 19.4R2-S2, 19.4R3-S1, 20.1R1-S4, 20.1R2, 20.2R2, 20.3R1,
and all subsequent releases.
This issue is being tracked as 1525318 and 1529210 .
*Late availability
Workaround:
Use access lists or firewall filters to limit CLI access to the device only
from trusted, administrative networks or hosts.
Limit access to the Junos OS shell to only trusted system administrators.
Implementation:
Software releases or updates are available for download at https://
www.juniper.net/support/downloads/ .
Modification History:
2021-01-13: Initial Publication.
2021-01-14: Added 15.1R7-S9 (late availability).
CVSS Score:
7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Severity Level:
High
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common
Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."
Acknowledgements:
Juniper SIRT would like to acknowledge and thank Hoang Thach Nguyen (d4rkn3ss)
of STAR Labs for responsibly reporting this vulnerability.
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