CVE-2017-18349

Fastjson vulnerability

CVSS

9.8

EPSS

39.0%

EPSS pct

98th

Exploited

No known

parseObject in Fastjson before 1.2.25, as used in FastjsonEngine in Pippo 1.11.0 and other products, allows remote attackers to execute arbitrary code via a crafted JSON request, as demonstrated by a crafted rmi:// URI in the dataSourceName field of HTTP POST data to the Pippo /json URI, which is mishandled in AjaxApplication.java.

Affected vendor

Alibaba

Affected product

Fastjson

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness type (CWE)

CWE-20 — Improper Input Validation

Published

2018-10-23

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 39.0% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 98% of all scored CVEs.

Check your external exposure to CVE-2017-18349

Confirm whether Alibaba Fastjson is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2017-18349.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2017-18349

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2017-18349 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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