Описание
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.
A flaw was found in cups-filters. This vulnerability allows an out-of-bounds write via a crafted Portable Document Format (PDF) file with a large MediaBox value.
Отчет
This vulnerability is rated Moderate for Red Hat Enterprise Linux because a specially crafted PDF file, when processed by the cups-filters pdftoraster tool, can lead to an out-of-bounds write, potentially causing a denial of service. This affects Red Hat Enterprise Linux 7, 8, 9, and 10, as well as Fedora.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | cups-filters | Fix deferred | ||
| Red Hat Enterprise Linux 7 | cups-filters | Fix deferred | ||
| Red Hat Enterprise Linux 8 | cups-filters | Fix deferred | ||
| Red Hat Enterprise Linux 9 | cups-filters | Fix deferred |
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Дополнительная информация
Статус:
EPSS
4 Medium
CVSS3
Связанные уязвимости
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 50d94ca0f2fa6177613c97c...
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 50d94ca0f2fa6177613c97c597
cups-filters contains backends, filters, and other software required t ...
Уязвимость пакета для печати CUPS Filters и библиотеки для сервера печати Libcupsfilters, позволяющая нарушителю вызвать отказ в обслуживании
EPSS
4 Medium
CVSS3