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AUSCERT External Security Bulletin Redistribution
ESB-2014.0524
Out of Cycle Security Bulletin: ScreenOS: Malformed SSL
packet can cause denial of service (DoS) (CVE-2014-2842)
17 April 2014
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AusCERT Security Bulletin Summary
---------------------------------
Product: ScreenOS
Publisher: Juniper Networks
Operating System: Juniper
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2014-2842
Original Bulletin:
https://kb.juniper.net/InfoCenter/index?page=content&id=JSA10624
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Out of Cycle Security Bulletin: ScreenOS: Malformed SSL packet can cause
denial of service (DoS) (CVE-2014-2842)
Categories:
Firewalls ISG/NS/SSG Series
ScreenOS
SIRT Advisory
Security Advisories ID: JSA10624
Last Updated: 16 Apr 2014
Version: 5.0
PRODUCT AFFECTED:
This issue can affect ScreenOS 6.3.
PROBLEM:
A denial of service (DoS) issue has been discovered in ScreenOS firewalls
that can be exploited by remote unauthenticated attackers. When a malformed
SSL/TLS protocol packet is sent to a vulnerable ScreenOS firewall, the
firewall crashes and restarts or if in a HA configuration triggers a failover.
The issue can be repeatedly exploited to create an extended denial of service
condition.
Older versions of ScreenOS have reached the end of support milestone and have
not been evaluated for the issue, but are likely affected. Customers are
advised to upgrade to a fixed supported release once it is made available.
While Juniper has not seen any malicious exploitation of this vulnerability,
the packet has been found in normal network activity.
No other Juniper Networks products or platforms are affected by this issue.
This issue has been assigned CVE-2014-2842.
SOLUTION:
Juniper Networks has released patches to resolve this issue (see the links
below):
Note: The fix will also be a part of ScreenOS 6.3.0r17 that is currently
under developement.
NS-5200/5400 M3:
https://download.juniper.net/software/firewall/ns5000.6.3.0-M3A.r16a-dfj1.0
NS-5200/5400 M2:
https://download.juniper.net/software/firewall/ns5000.6.3.0-M2A.r16a-dfj1.0
ISG-2000 with IDP:
https://download.juniper.net/software/firewall/nsISG2000.6.3.0-IDP1.r16a-dfj1.0
ISG-2000:
https://download.juniper.net/software/firewall/nsISG2000.6.3.0r16a-dfj1.0
ISG-1000 with IDP:
https://download.juniper.net/software/firewall/nsISG1000.6.3.0-IDP1.r16a-dfj1.0
ISG-1000:
https://download.juniper.net/software/firewall/nsISG1000.6.3.0r16a-dfj1.0
SSG-520/SSG-550:
https://download.juniper.net/software/firewall/ssg500.6.3.0r16a-dfj1.0
SSG-320/SSG-350:
https://download.juniper.net/software/firewall/ssg320ssg350.6.3.0r16a-dfj1.0
SSG-140:
https://download.juniper.net/software/firewall/ssg140.6.3.0r16a-dfj1.0
SSG-5/20:
https://download.juniper.net/software/firewall/ssg5ssg20.6.3.0r16a-dfj1.0
KB16765 - "In which releases are vulnerabilities fixed?" describes which
release vulnerabilities are fixed as per our End of Engineering and End of
Life support policies.
WORKAROUND:
Due to the likelihood of the specific packet occurring during normal activity,
Juniper recommends disabling WebUI (SSL) and WebAuth (SSL) until a software
fix is available. This includes disabling WebUI (SSL) and WebAuth (SSL) even
on internal and protected networks.
This issue is completely mitigated when WebUI (SSL) and WebAuth (SSL) is
disabled.
Disabling SSL WebUI (HTTPS) is part of our best practices, as mentioned in
KB29016.
IMPLEMENTATION:
RELATED LINKS:
KB16613: Overview of the Juniper Networks SIRT Monthly Security Bulletin
Publication Process
KB16765: In which releases are vulnerabilities fixed?
KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories.
Report a Vulnerability - How to Contact the Juniper Networks Security Incident
Response Team
CVE-2014-2842: Malformed SSL packet can cause denial of service (DoS) on
ScreenOS firewalls
CVSS SCORE:
7.8 (AV:N/AC:L/Au:N/C:N/I:N/A:C)
RISK LEVEL:
High
RISK 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:
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