Vulnerability identifier: #VU82440

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2015-5358

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Juniper Junos OS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of active TCP sessions. A remote attacker can send a large number of requests that trigger a TCP connection to move to the LAST_ACK state when there is more data to send and consume all available mbufs, resulting in a denial of service condition.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 14.2 - 14.2R, 14.1 - 14.1R2-S10, 14.1x53, 13.3 - 13.3R2, 13.2x51, 13.2 - 13.2R4, 12.3 - 12.3R7, 12.1 - 12.1R10, 12.1x44 - 12.1X44-D35, 12.1x46 - 12.1X46-D30, 12.3x48 - 12.3X48-D10, 15.1 - 15.1R, 15.1F - 15.1F7-S2

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External links
http://supportportal.juniper.net/s/article/2015-07-Security-Bulletin-Junos-mbuf-exhaustion-due-to-sessions-stuck-in-LAST-ACK-state-CVE-2015-5358

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.