CVE-2019-15792— Type confusion in shiftfs
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I. Basic Information for CVE-2019-15792
Vulnerability Information
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Vulnerability Title
Type confusion in shiftfs
Source: NVD (National Vulnerability Database)
Vulnerability Description
In shiftfs, a non-upstream patch to the Linux kernel included in the Ubuntu 5.0 and 5.3 kernel series, shiftfs_btrfs_ioctl_fd_replace() calls fdget(oldfd), then without further checks passes the resulting file* into shiftfs_real_fdget(), which casts file->private_data, a void* that points to a filesystem-dependent type, to a "struct shiftfs_file_info *". As the private_data is not required to be a pointer, an attacker can use this to cause a denial of service or possibly execute arbitrary code.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会发布的开源操作系统Linux所使用的内核。Canonical Ubuntu Linux是英国Canonical公司的一套Linux操作系统。 Canonical Ubuntu Linux 18.04（lts）版本和19.04版本中的Linux kernel 5.0版本和5.3版本存在类型混淆漏洞。本地攻击者可利用该漏洞造成拒绝服务（系统崩溃）或可能执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Ubuntu | Shiftfs in the Linux kernel | 5.3.0-11.12 ~ 5.3 kernel* | - |
II. Public POCs for CVE-2019-15792
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://usn.ubuntu.com/usn/usn-4184-1x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2019-15792
Same Patch Batch · Ubuntu · 2020-04-23 · 4 CVEs total
| CVE-2019-15791 | 7.1 HIGH | Reference count underflow in shiftfs |
| CVE-2019-15794 | 7.1 HIGH | Reference counting error in overlayfs/shiftfs error path when used in conjuction with aufs |
| CVE-2019-15793 | 6.5 MEDIUM | Mishandling of file-system uid/gid with namespaces in shiftfs |
IV. Related Vulnerabilities
V. Comments for CVE-2019-15792
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