CVE-2025-64503

Description

cups-filters contains backends, filters, and other software required to get the cups printing service working on operating systems other than macos. In cups-filters prior to 1.28.18, by crafting a PDF file with a large `MediaBox` value, an attacker can cause CUPS-Filter 1.x’s `pdftoraster` tool to write beyond the bounds of an array. First, a PDF with a large `MediaBox` width value causes `header.cupsWidth` to become large. Next, the calculation of `bytesPerLine = (header.cupsBitsPerPixel * header.cupsWidth + 7) / 8` overflows, resulting in a small value. Then, `lineBuf` is allocated with the small `bytesPerLine` size. Finally, `convertLineChunked` calls `writePixel8`, which attempts to write to `lineBuf` outside of its buffer size (out of bounds write). In libcupsfilters, the maintainers found the same `bytesPerLine` multiplication without overflow check, but the provided test case does not cause an overflow there, because the values are different. Commit 50d94ca0f2fa6177613c97c59791bde568631865 contains a patch, which is incorporated into cups-filters version 1.28.18.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
cups-filters	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.04 LTS noble	Not affected
	22.04 LTS jammy	Fixed 1.28.15-0ubuntu1.5
	20.04 LTS focal	Fixed 1.27.4-1ubuntu0.4+esm1
	18.04 LTS bionic	Fixed 1.20.2-0ubuntu3.3+esm2
	16.04 LTS xenial	Fixed 1.8.3-2ubuntu3.5+esm3
libcupsfilters	25.10 questing	Fixed 2.1.1-0ubuntu3.1
	25.04 plucky	Fixed 2.1.1-0ubuntu2.1
	24.04 LTS noble	Fixed 2.0.0-0ubuntu7.2
	22.04 LTS jammy	Not in release

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Notes

mdeslaur

filename changed from pdftoraster.cxx to pdftoraster.c in newer versions In cups-filters 2.x, this is just a wrapper

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
cups-filters	Upstream: 50d94ca
libcupsfilters	Upstream: fd01543

Severity score breakdown

Parameter	Value
Base score	4.0 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVE-2025-64503

Cvss 3 Severity Score