CVE-2018-1000656 — The Pallets Project flask version Before 0

The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in flask that can result in Large amount of memory usage possibly leading to denial of service. This attack appear to be exploitable via Attacker provides JSON data in incor

01What is this vulnerability?

The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in flask that can result in Large amount of memory usage possibly leading to denial of service. This attack appear to be exploitable via Attacker provides JSON data in incorrect encoding. This vulnerability appears to have been fixed in 0.12.3. NOTE: this may overlap CVE-2019-1010083.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

08Timeline

• Published: 2018-08-20T19:00:00.000Z
• Last modified: 2024-08-05T12:40:47.801Z

09References

• security.netapp.com — https://security.netapp.com/advisory/ntap-20190221-0001/
• github.com — https://github.com/pallets/flask/pull/2691
• github.com — https://github.com/pallets/flask/releases/tag/0.12.3
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/08/msg00025.html
• usn.ubuntu.com — https://usn.ubuntu.com/4378-1/