An issue was discovered in Xen through 4.9.x allowing guest OS users to cause a denial of service (host OS crash) or gain host OS privileges by leveraging an incorrect mask for reference-count overflow checking in shadow mode.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
| Link | Tags |
|---|---|
| http://www.securityfocus.com/bid/102169 | vdb entry |
| http://www.securitytracker.com/id/1040769 | vdb entry |
| https://lists.debian.org/debian-lts-announce/2018/01/msg00003.html | mailing list |
| https://lists.debian.org/debian-lts-announce/2018/10/msg00009.html | mailing list |
| http://www.openwall.com/lists/oss-security/2017/12/12/2 | mailing list |
| https://security.gentoo.org/glsa/201801-14 | vendor advisory |
| https://xenbits.xen.org/xsa/advisory-249.html | patch vendor advisory mitigation |
| https://www.debian.org/security/2018/dsa-4112 | vendor advisory |
| https://support.citrix.com/article/CTX232096 |