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19 lines
1.3 KiB
Markdown
19 lines
1.3 KiB
Markdown
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### [CVE-2018-1000204](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-1000204)
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### Description
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** 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."
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### POC
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#### Reference
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- https://github.com/torvalds/linux/commit/a45b599ad808c3c982fdcdc12b0b8611c2f92824
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- https://usn.ubuntu.com/3696-1/
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#### Github
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No PoCs found on GitHub currently.
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