Out-of-bounds read in Pillow - CVE-2021-25287

Vulnerability identifier: #VU52187

CSH Severity: Medium

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2021-25287

CWE-ID: CWE-125

Exploitation vector: Remote access

Exploit availability: No public exploit available

Affected software:
Pillow
openSUSE Leap
Ubuntu
Fedora
python3-pil (Ubuntu package)
python-pil (Ubuntu package)
mingw-python-pillow
python-pillow
python-Pillow-debuginfo
python3-Pillow-tk
python-Pillow-debugsource
python3-Pillow
python3-Pillow-tk-debuginfo
python3-Pillow-debuginfo

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in Jpeg2KDecode method. A remote attacker can create a specially crafted J2k image, trigger out-of-bounds read error and read contents of memory on the system.

Install updates from vendor's website.

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