Discovery API Icon
Discovery API
Security Advisory Icon
Security Advisory
Alpaquita LinuxStreamSecurity Advisory
Search Cve

CVE-2018-1000204

Published: June 26, 2018Last modified: November 9, 2023

Description

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.

Severity score breakdown

ParameterValue
Base score5.3
Attack VectorNETWORK
Attack complexityHIGH
Privileges requiredLOW
User interactionNONE
ScopeUNCHANGED
ConfidentialityHIGH
Integrity impactNONE
Availability impactNONE
VectorCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Status

ProductReleasePackageStatus
Alpaquita Linux23 LTSlinux-ltsNot affected (6.1.50-r0)
Streamlinux-ltsNot affected (6.1.50-r0)

References

ON THIS PAGE