CVE-2019-18425
xen: missing descriptor table limit checking in x86 PV emulation leading to privilege escalation
Einstufung nach Quelle
Trivys eigenes Label ist CRITICAL. Kritisch laut NVD. Niedriger laut Red Hat (hoch), Ubuntu (mittel).
Beschreibung
An issue was discovered in Xen through 4.12.x allowing 32-bit PV guest OS users to gain guest OS privileges by installing and using descriptors. There is missing descriptor table limit checking in x86 PV emulation. When emulating certain PV guest operations, descriptor table accesses are performed by the emulating code. Such accesses should respect the guest specified limits, unless otherwise guaranteed to fail in such a case. Without this, emulation of 32-bit guest user mode calls through call gates would allow guest user mode to install and then use descriptors of their choice, as long as the guest kernel did not itself install an LDT. (Most OSes don't install any LDT by default). 32-bit PV guest user mode can elevate its privileges to that of the guest kernel. Xen versions from at least 3.2 onwards are affected. Only 32-bit PV guest user mode can leverage this vulnerability. HVM, PVH, as well as 64-bit PV guests cannot leverage this vulnerability. Arm systems are unaffected.
Betroffene Pakete und behobene Versionen
| Quelle | Paket | Behoben in |
|---|---|---|
| alpine 3.10 | xen | 4.12.1-r1 |
| alpine 3.11 | xen | 4.13.0-r0 |
| alpine 3.12 | xen | 4.13.0-r0 |
| alpine 3.13 | xen | 4.13.0-r0 |
| alpine 3.14 | xen | 4.13.0-r0 |
| alpine 3.15 | xen | 4.13.0-r0 |
| alpine 3.16 | xen | 4.13.0-r0 |
| alpine 3.17 | xen | 4.13.0-r0 |
| alpine 3.18 | xen | 4.13.0-r0 |
| alpine 3.19 | xen | 4.13.0-r0 |
| alpine 3.20 | xen | 4.13.0-r0 |
| alpine 3.21 | xen | 4.13.0-r0 |
Alle 27 Einträge aus 27 Quellen zeigen
| Quelle | Paket | Behoben in |
|---|---|---|
| alpine 3.10 | xen | 4.12.1-r1 |
| alpine 3.11 | xen | 4.13.0-r0 |
| alpine 3.12 | xen | 4.13.0-r0 |
| alpine 3.13 | xen | 4.13.0-r0 |
| alpine 3.14 | xen | 4.13.0-r0 |
| alpine 3.15 | xen | 4.13.0-r0 |
| alpine 3.16 | xen | 4.13.0-r0 |
| alpine 3.17 | xen | 4.13.0-r0 |
| alpine 3.18 | xen | 4.13.0-r0 |
| alpine 3.19 | xen | 4.13.0-r0 |
| alpine 3.20 | xen | 4.13.0-r0 |
| alpine 3.21 | xen | 4.13.0-r0 |
| alpine 3.22 | xen | 4.13.0-r0 |
| alpine 3.23 | xen | 4.13.0-r0 |
| alpine 3.24 | xen | 4.13.0-r0 |
| alpine 3.8 | xen | 4.10.4-r1 |
| alpine 3.9 | xen | 4.11.2-r1 |
| alpine edge | xen | 4.13.0-r0 |
| debian 10 | xen | 4.11.3+24-g14b62ab3e5-1~deb10u1 |
| debian 11 | xen | 4.11.3+24-g14b62ab3e5-1 |
| debian 12 | xen | 4.11.3+24-g14b62ab3e5-1 |
| debian 13 | xen | 4.11.3+24-g14b62ab3e5-1 |
| debian 14 | xen | 4.11.3+24-g14b62ab3e5-1 |
| debian 8 | xen | kein Fix angegeben |
| debian 9 | xen | 4.8.5.final+shim4.10.4-1+deb9u12 |
| echo | xen | 4.11.3+24-g14b62ab3e5-1 |
| ubuntu 18.04-ESM | xen | kein Fix angegeben |
Referenzen
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00037.html
- http://www.openwall.com/lists/oss-security/2019/10/31/2
- http://xenbits.xen.org/xsa/advisory-298.html
- https://access.redhat.com/security/cve/CVE-2019-18425
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/
- https://nvd.nist.gov/vuln/detail/CVE-2019-18425