CVE-2020-11741

An issue was discovered in xenoprof in Xen through 4.13.x, allowing guest OS users (with active profiling) to obtain sensitive information about other guests, cause a denial of service, or possibly gain privileges. For guests for which "active" profiling was enabled by the administrator, the xenoprof code uses the standard Xen shared ring structure. Unfortunately, this code did not treat the guest as a potential adversary: it trusts the guest not to modify buffer size information or modify head / tail pointers in unexpected ways. This can crash the host (DoS). Privilege escalation cannot be ruled out.

This update for xen fixes the following issues:

Security issues fixed:

• CVE-2020-11742: Bad continuation handling in GNTTABOP_copy (bsc#1169392).
• CVE-2020-11740, CVE-2020-11741: xen: XSA-313 multiple xenoprof issues (bsc#1168140).
• CVE-2020-11739: Missing memory barriers in read-write unlock paths (bsc#1168142).
• CVE-2020-11743: Bad error path in GNTTABOP_map_grant (bsc#1168143).
• arm: a CPU may speculate past the ERET instruction (bsc#1160932).

Non-security issues fixed:

• Xenstored Crashed during VM install (bsc#1167152)
• DomU hang: soft lockup CPU #0 stuck under high load (bsc#1165206, bsc#1134506)
• Update API compatibility versions, fixes issues for libvirt. (bsc#1167007, bsc#1157490)
• aacraid blocks xen commands (bsc#1155200)

This update was imported from the SUSE:SLE-15-SP1:Update update project.

This update for xen fixes the following issues:

Security issues fixed:

• CVE-2020-11742: Bad continuation handling in GNTTABOP_copy (bsc#1169392).
• CVE-2020-11740, CVE-2020-11741: xen: XSA-313 multiple xenoprof issues (bsc#1168140).
• CVE-2020-11739: Missing memory barriers in read-write unlock paths (bsc#1168142).
• CVE-2020-11743: Bad error path in GNTTABOP_map_grant (bsc#1168143).
• arm: a CPU may speculate past the ERET instruction (bsc#1160932).

Non-security issues fixed:

• Xenstored Crashed during VM install (bsc#1167152)
• DomU hang: soft lockup CPU #0 stuck under high load (bsc#1165206, bsc#1134506)
• Update API compatibility versions, fixes issues for libvirt. (bsc#1167007, bsc#1157490)
• aacraid blocks xen commands (bsc#1155200)

This update for xen fixes the following issues:

Security issues fixed:

• CVE-2020-11742: Bad continuation handling in GNTTABOP_copy (bsc#1169392).
• CVE-2020-11740, CVE-2020-11741: xen: XSA-313 multiple xenoprof issues (bsc#1168140).
• CVE-2020-11739: Missing memory barriers in read-write unlock paths (bsc#1168142).
• CVE-2020-11743: Bad error path in GNTTABOP_map_grant (bsc#1168143).
• CVE-2020-7211: Fixed potential directory traversal using relative paths via tftp server on Windows host (bsc#1161181).
• arm: a CPU may speculate past the ERET instruction (bsc#1160932).

Non-security issues fixed:

• Xenstored Crashed during VM install (bsc#1167152)
• DomU hang: soft lockup CPU #0 stuck under high load (bsc#1165206, bsc#1134506)
• Update API compatibility versions, fixes issues for libvirt. (bsc#1167007, bsc#1157490)
• aacraid blocks xen commands (bsc#1155200)

This update for xen to version 4.12.2 fixes the following issues:

Security issues fixed:

• CVE-2020-11742: Bad continuation handling in GNTTABOP_copy (bsc#1169392).
• CVE-2020-11740, CVE-2020-11741: xen: XSA-313 multiple xenoprof issues (bsc#1168140).
• CVE-2020-11739: Missing memory barriers in read-write unlock paths (bsc#1168142).
• CVE-2020-11743: Bad error path in GNTTABOP_map_grant (bsc#1168143).
• CVE-2020-7211: Fixed potential directory traversal using relative paths via tftp server on Windows host (bsc#1161181).
• arm: a CPU may speculate past the ERET instruction (bsc#1160932).

Non-security issues fixed:

• Xenstored Crashed during VM install (bsc#1167152)
• DomU hang: soft lockup CPU #0 stuck under high load (bsc#1165206, bsc#1134506)
• Update API compatibility versions, fixes issues for libvirt. (bsc#1167007, bsc#1157490)
• aacraid blocks xen commands (bsc#1155200)
• Problems Booting Fedora31 VM on sles15 sp1 Xen Dom0 (bsc#1162040).

This update for xen fixes the following issues:

• bsc#1174543 - secure boot related fixes
• bsc#1163019 - CVE-2020-8608: potential OOB access due to unsafe snprintf() usages
• bsc#1169392 - CVE-2020-11742: Bad continuation handling in GNTTABOP_copy
• bsc#1168140 - CVE-2020-11740, CVE-2020-11741: multiple xenoprof issues
• bsc#1161181 - CVE-2020-7211: potential directory traversal using relative paths via tftp server on Windows host
• bsc#1157888 - CVE-2019-19579: Device quarantine for alternate pci assignment methods
• bsc#1158004 - CVE-2019-19583: VMX: VMentry failure with debug exceptions and blocked states
• bsc#1158005 - CVE-2019-19578: Linear pagetable use / entry miscounts
• bsc#1158006 - CVE-2019-19580: Further issues with restartable PV type change operations
• bsc#1158007 - CVE-2019-19577: dynamic height for the IOMMU pagetables
• bsc#1154448 - CVE-2019-18420: VCPUOP_initialise DoS
• bsc#1154456 - CVE-2019-18425: missing descriptor table limit checking in x86 PV emulation
• bsc#1154458 - CVE-2019-18421: Issues with restartable PV type change operations
• bsc#1154461 - CVE-2019-18424: passed through PCI devices may corrupt host memory after deassignment
• bsc#1155945 - CVE-2018-12207: Machine Check Error Avoidance on Page Size Change (aka IFU issue)
• bsc#1152497 - CVE-2019-11135: TSX Asynchronous Abort (TAA) issue

This update for xen fixes the following issues:

• bsc#1174543 - secure boot related fixes
• bsc#1163019 - CVE-2020-8608: potential OOB access due to unsafe snprintf() usages
• bsc#1169392 - CVE-2020-11742: Bad continuation handling in GNTTABOP_copy
• bsc#1168140 - CVE-2020-11740, CVE-2020-11741: multiple xenoprof issues
• bsc#1161181 - CVE-2020-7211: potential directory traversal using relative paths via tftp server on Windows host
• bsc#1154456 - CVE-2019-18425: missing descriptor table limit checking in x86 PV emulation
• bsc#1154458 - CVE-2019-18421: Issues with restartable PV type change operations

This update for xen fixes the following issues:

• CVE-2020-0543: Fixed a side channel attack against special registers which could have resulted in leaking of read values to cores other than the one which called it. This attack is known as Special Register Buffer Data Sampling (SRBDS) or 'CrossTalk' (bsc#1172205).
• CVE-2020-11742: Bad continuation handling in GNTTABOP_copy (bsc#1169392).
• CVE-2020-11740, CVE-2020-11741: xen: XSA-313 multiple xenoprof issues (bsc#1168140).
• CVE-2020-11739: Missing memory barriers in read-write unlock paths (bsc#1168142).
• CVE-2019-19583: Fixed improper checks which could have allowed HVM/PVH guest userspace code to crash the guest, leading to a guest denial of service (bsc#1158004 XSA-308).
• CVE-2019-19581: Fixed a potential out of bounds on 32-bit Arm (bsc#1158003 XSA-307).
• CVE-2019-19580: Fixed a privilege escalation where a malicious PV guest administrator could have been able to escalate their privilege to that of the host (bsc#1158006 XSA-310).
• CVE-2019-19579: Fixed a privilege escalation where an untrusted domain with access to a physical device can DMA into host memory (bsc#1157888 XSA-306).
• CVE-2019-19578: Fixed an issue where a malicious or buggy PV guest could have caused hypervisor crash resulting in denial of service affecting the entire host (bsc#1158005 XSA-309).
• CVE-2019-19577: Fixed an issue where a malicious guest administrator could have caused Xen to access data structures while they are being modified leading to a crash (bsc#1158007 XSA-311).
• Xenstored Crashed during VM install (bsc#1167152)

This update for xen fixes the following issues:

• CVE-2020-0543: Fixed a side channel attack against special registers which could have resulted in leaking of read values to cores other than the one which called it. This attack is known as Special Register Buffer Data Sampling (SRBDS) or 'CrossTalk' (bsc#1172205).
• CVE-2020-11742: Bad continuation handling in GNTTABOP_copy (bsc#1169392).
• CVE-2020-11740, CVE-2020-11741: xen: XSA-313 multiple xenoprof issues (bsc#1168140).
• CVE-2020-11739: Missing memory barriers in read-write unlock paths (bsc#1168142).
• CVE-2020-11743: Bad error path in GNTTABOP_map_grant (bsc#1168143).
• Xenstored Crashed during VM install (bsc#1167152)

This update for xen fixes the following issues:

• bsc#1174543 - secure boot related fixes
• bsc#1163019 - CVE-2020-8608: Potential OOB access due to unsafe snprintf() usages
• bsc#1169392 - CVE-2020-11742: Bad continuation handling in GNTTABOP_copy
• bsc#1168140 - CVE-2020-11740, CVE-2020-11741: Multiple xenoprof issues
• bsc#1168142 - CVE-2020-11739: Missing memory barriers in read-write unlock paths

It was discovered that memory contents previously stored in microarchitectural special registers after RDRAND, RDSEED, and SGX EGETKEY read operations on Intel client and Xeon E3 processors may be briefly exposed to processes on the same or different processor cores. A local attacker could use this to expose sensitive information. (CVE-2020-0543)

Julien Grall discovered that Xen incorrectly handled memory barriers on ARM-based systems. An attacker could possibly use this issue to cause a denial of service, obtain sensitive information or escalate privileges. (CVE-2020-11739)

Ilja Van Sprundel discovered that Xen incorrectly handled profiling of guests. An unprivileged attacker could use this issue to obtain sensitive information from other guests, cause a denial of service or possibly gain privileges. (CVE-2020-11740, CVE-2020-11741)

It was discovered that Xen incorrectly handled grant tables. A malicious guest could possibly use this issue to cause a denial of service. (CVE-2020-11742, CVE-2020-11743)

Jan Beulich discovered that Xen incorrectly handled certain code paths. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-15563)

Julien Grall discovered that Xen incorrectly verified memory addresses provided by the guest on ARM-based systems. A malicious guest administrator could possibly use this issue to cause a denial of service. (CVE-2020-15564)

Roger Pau Monné discovered that Xen incorrectly handled caching on x86 Intel systems. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-15565)

It was discovered that Xen incorrectly handled error in event-channel port allocation. A malicious guest could possibly use this issue to cause a denial of service. (CVE-2020-15566)

Jan Beulich discovered that Xen incorrectly handled certain EPT (Extended Page Tables). An attacker could possibly use this issue to cause a denial of service, data corruption or privilege escalation. (CVE-2020-15567)

Andrew Cooper discovered that Xen incorrectly handled PCI passthrough. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25595)

Andrew Cooper discovered that Xen incorrectly sanitized path injections. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25596)

Jan Beulich discovered that Xen incorrectly handled validation of event channels. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25597)

Julien Grall and Jan Beulich discovered that Xen incorrectly handled resetting event channels. An attacker could possibly use this issue to cause a denial of service or obtain sensitive information. (CVE-2020-25599)

Julien Grall discovered that Xen incorrectly handled event channels memory allocation on 32-bits domains. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25600)

Jan Beulich discovered that Xen incorrectly handled resetting or cleaning up event channels. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25601)

Andrew Cooper discovered that Xen incorrectly handled certain Intel specific MSR (Model Specific Registers). An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25602)

Julien Grall discovered that Xen incorrectly handled accessing/allocating event channels. An attacker could possibly use this issue to cause a denial of service, obtain sensitive information of privilege escalation. (CVE-2020-25603)

Igor Druzhinin discovered that Xen incorrectly handled locks. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-25604)