CVE-2019-18420 (GCVE-0-2019-18420)

Vulnerability from cvelistv5 – Published: 2019-10-31 13:30 – Updated: 2024-08-05 01:54
VLAI?
Summary
An issue was discovered in Xen through 4.12.x allowing x86 PV guest OS users to cause a denial of service via a VCPUOP_initialise hypercall. hypercall_create_continuation() is a variadic function which uses a printf-like format string to interpret its parameters. Error handling for a bad format character was done using BUG(), which crashes Xen. One path, via the VCPUOP_initialise hypercall, has a bad format character. The BUG() can be hit if VCPUOP_initialise executes for a sufficiently long period of time for a continuation to be created. Malicious guests may cause a hypervisor crash, resulting in a Denial of Service (DoS). Xen versions 4.6 and newer are vulnerable. Xen versions 4.5 and earlier are not vulnerable. Only x86 PV guests can exploit the vulnerability. HVM and PVH guests, and guests on ARM systems, cannot exploit the vulnerability.
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
http://xenbits.xen.org/xsa/advisory-296.html x_refsource_MISC
http://www.openwall.com/lists/oss-security/2019/10/31/1 mailing-listx_refsource_MLIST
http://lists.opensuse.org/opensuse-security-annou… vendor-advisoryx_refsource_SUSE
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac… vendor-advisoryx_refsource_FEDORA
https://www.debian.org/security/2020/dsa-4602 vendor-advisoryx_refsource_DEBIAN
https://seclists.org/bugtraq/2020/Jan/21 mailing-listx_refsource_BUGTRAQ
https://security.gentoo.org/glsa/202003-56 vendor-advisoryx_refsource_GENTOO
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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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