Integer overflow in Xen - CVE-2018-15471
Published: August 21, 2018
Vulnerability identifier: #VU14475
CSH Severity: Low
CVSS v4: 8.7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-15471
CWE-ID: CWE-190
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an adjacent attacker to gain elevated privileges on the target system.
The vulnerability exists in xenvif_set_hash_mapping in drivers/net/xen-netback/hash.c due to integer overflow when handling malicious input. An adjacent attacker can supply a malicious or buggy frontend request to set or change mapping of requests to request queues, cause the (usually privileged) backend to make out of bounds memory accesses and gain access to arbitrary data, cause the service to crash or gain elevated privileges.
Affected software
Xen
Debian Linux
Linux kernel
Fedora
xen (Alpine package)
kernel-headers
kernel
Debian Linux
Linux kernel
Fedora
xen (Alpine package)
kernel-headers
kernel
How to mitigate CVE-2018-15471
Install update from vendor's website.
Linux kernel - update to 4.18.14
xen (Alpine package) - update to 4.10.1-r3
kernel-headers - addressed in versions 4.17.17-1.fc27, 4.17.17-1.fc28
kernel - addressed in versions 4.17.17-100.fc27, 4.17.17-200.fc28
xen (Alpine package) - update to 4.10.1-r3
kernel-headers - addressed in versions 4.17.17-1.fc27, 4.17.17-1.fc28
kernel - addressed in versions 4.17.17-100.fc27, 4.17.17-200.fc28