-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 - ------------------------------------------------------------------------- Debian Security Advisory DSA-4112-1 security@xxxxxxxxxx https://www.debian.org/security/ Moritz Muehlenhoff February 14, 2018 https://www.debian.org/security/faq - ------------------------------------------------------------------------- Package : xen CVE ID : CVE-2017-17563 CVE-2017-17564 CVE-2017-17565 CVE-2017-17566 Multiple vulnerabilities have been discovered in the Xen hypervisor: CVE-2017-17563 Jan Beulich discovered that an incorrect reference count overflow check in x86 shadow mode may result in denial of service or privilege escalation. CVE-2017-17564 Jan Beulich discovered that improper x86 shadow mode reference count error handling may result in denial of service or privilege escalation. CVE-2017-17565 Jan Beulich discovered that an incomplete bug check in x86 log-dirty handling may result in denial of service. CVE-2017-17566 Jan Beulich discovered that x86 PV guests may gain access to internally used pages which could result in denial of service or potential privilege escalation. In addition this update ships the "Comet" shim to address the Meltdown class of vulnerabilities for guests with legacy PV kernels. In addition, the package provides the "Xen PTI stage 1" mitigation which is built-in and enabled by default on Intel systems, but can be disabled with `xpti=false' on the hypervisor command line (It does not make sense to use both xpti and the Comet shim.) Please refer to the following URL for more details on how to configure individual mitigation strategies: https://xenbits.xen.org/xsa/advisory-254.html Additional information can also be found in README.pti and README.comet. For the stable distribution (stretch), these problems have been fixed in version 4.8.3+comet2+shim4.10.0+comet3-1+deb9u4.1. We recommend that you upgrade your xen packages. For the detailed security status of xen please refer to its security tracker page at: https://security-tracker.debian.org/tracker/xen Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/ Mailing list: debian-security-announce@xxxxxxxxxxxxxxxx -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEtuYvPRKsOElcDakFEMKTtsN8TjYFAlqErBcACgkQEMKTtsN8 TjaR6BAAlxX93JKrd2klt5IlZ7+0FGw7Ml5lg81+ZDsMqAkOox9ynRzzN87nzmRX HhSQWU5fU8RQUSvMKOgTGLE6tZ3aOX/5vTsCFrxqr6M01X4yYONXe6n2+M/Cnm00 IwVxeVudZVv7ue1bxbBa6YBXxa0Z5+5m19qtU33EHUwIh6W/pHMTKcU9cw57mhiI Qxojsi3/9M4rdwh2BGLVpHQ8qW4wyMvf8HOXn4SVqWGBK3LZCmyGuOKgj4gYuk13 3qg+i8WOCZsubvximYb41eu8XfW0oihajgmB/SkWBtScs/q09wn1gRh/kwEBmPzs 3s5d/Z47VAEP5O8lJHJmHX1+ULKczgsFHWb6vDeUgrrvWqGZ2hdZUkeo5mVLF2iB h2NlSSm734Lxb0jGLcpDWiYitpzv3vGvm8tf14r8Vt4mfEb+6+pD8T7tD5pK4Gb0 weFE+PoakMbzmTKjkyets6kKOLh9rwoO5pk+Epg8ancVYG7wkCenpb/GIID94yly nitfKQMr9uuFP1tp04aCVcXfsDVnCKkTwfRx6Ie4LS9m38MiNosxJogWS6ywOFj2 os/DcYMtn/J5w+9YPOHqLod7yJVXBBA0rb1etN8r/I76RjX/d085rjN4UQ17wdrU kRFdAPmsyZ6XEgmACfppczEXS+3adLp6GGfMiunzR0Ruxvq2AHA= =o99Q -----END PGP SIGNATURE-----
