#VU52191 Input validation error in Pillow - CVE-2021-28677

Vulnerability identifier: #VU52191

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-28677

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Pillow
Universal components / Libraries / Libraries used by multiple products

Vendor: Alex Clark and Contributors

Description

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

The vulnerability exists due to insufficient validation of user-supplied input when processing new line characters, such as "\r", "\n" when opening files. A remote attacker can pass specially crafted file to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Pillow: 1.0 - 8.1.2

---

External links
https://github.com/python-pillow/Pillow/releases/tag/8.2.0
https://github.com/python-pillow/Pillow/pull/5377/commits/8ec027867f19633d9adfc5c8b7504d9b609fc5f1

---

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.