mbuf exhaustion in Junos OS

1) Resource exhaustion

EUVDB-ID: #VU82440

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 - Resource exhaustion

Exploit availability: No

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: 12.1 - 15.1R

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

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.