#VU24205 Buffer overflow in Pillow - CVE-2019-19911

Vulnerability identifier: #VU24205

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-2019-19911

CWE-ID: CWE-119

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 when processing FPX images due to the "FpxImagePlugin.py" calls the range function on an unvalidated 32-bit integer if the number of bands is large. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.

On Windows running 32-bit Python, this results in an OverflowError or MemoryError due to the 2 GB limit. However, on Linux running 64-bit Python this results in the process being terminated by the OOM killer.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Pillow: 1.0 - 6.2.1

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External links
https://pillow.readthedocs.io/en/stable/releasenotes/6.2.2.html

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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.