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prionPRIOn knowledge basePRION:CVE-2018-1000204
HistoryJun 26, 2018 - 2:29 p.m.

Heap overflow

2018-06-2614:29:00
PRIOn knowledge base
www.prio-n.com
9

6 Medium

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

51.7%

DISPUTED Linux Kernel version 3.18 to 4.16 incorrectly handles an SG_IO ioctl on /dev/sg0 with dxfer_direction=SG_DXFER_FROM_DEV and an empty 6-byte cmdp. This may lead to copying up to 1000 kernel heap pages to the userspace. This has been fixed upstream in https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824 already. The problem has limited scope, as users don’t usually have permissions to access SCSI devices. On the other hand, e.g. the Nero user manual suggests doing chmod o+r+w /dev/sg* to make the devices accessible. NOTE: third parties dispute the relevance of this report, noting that the requirement for an attacker to have both the CAP_SYS_ADMIN and CAP_SYS_RAWIO capabilities makes it “virtually impossible to exploit.”