CVE-2019-3840

A NULL pointer dereference flaw was discovered in libvirt before version 5.0.0 in the way it gets interface information through the QEMU agent. An attacker in a guest VM can use this flaw to crash libvirtd and cause a denial of service.

A NULL pointer dereference flaw was discovered in libvirt before version 5.0.0 in the way it gets interface information through the QEMU agent. An attacker in a guest VM can use this flaw to crash libvirtd and cause a denial of service.

NULL pointer dereference after running qemuAgentCommand in qemuAgentGetInterfaces function. (CVE-2019-3840)

This update for libvirt provides the following fixes:

Security issue fixed:

• CVE-2019-3840: Fixed a null pointer dereference vulnerability in virJSONValueObjectHasKey function which could have resulted in a remote denial of service via the guest agent (bsc#1127458).

Other issues addressed:

• apparmor: reintroduce upstream lxc mount rules (bsc#1130129).
• hook: encode incoming XML to UTF-8 before passing to lxml etree from string method (bsc#1123642).
• supportconfig: collect rotated logs in /var/log/libvirt/* (bsc#1124667).
• libxl: support Xen's max_grant_frames setting with maxGrantFrames attribute on the xenbus controller (bsc#1126325).
• conf: added new 'xenbus' controller type
• util: skip RDMA detection for non-PCI network devices (bsc#1112182).
• qemu: don't use CAP_DAC_OVERRIDE capability if non-root (bsc#1125665).
• qemu: fix issues related to restricted permissions on /dev/sev(bsc#1102604).
• apparmor: add support for named profiles (bsc#1118952).
• libxl: save current memory value after successful balloon (bsc#1120813).
• apparmor: Fix ptrace rules. (bsc#1117058)
• libxl: Add support for soft reset. (bsc#1081516)
• libxl: Fix VM migration on busy hosts. (bsc#1108086)
• qemu: Add support for SEV guests. (fate#325817)
• util: Don't check for parallel iteration in hash-related functions. (bsc#1106420)
• spec: Don't restart libvirt-guests when updating libvirt-client. (bsc#1104662)
• Fix virNodeGetSEVInfo API crashing libvirtd on AMD SEV enabled hosts. (bsc#1108395)

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

This update for libvirt fixes the following issues:

Security issues fixed:

• CVE-2019-3840: Fixed a null pointer dereference vulnerability in virJSONValueObjectHasKey function which could have resulted in a remote denial of service via the guest agent (bsc#1127458).

Other issues fixed:

• libxl: save current memory value after successful balloon (bsc#1120813).
• spec: Don't restart libvirt-guests when updating libvirt-client (bsc#1104662).

This update for libvirt provides the following fixes:

Security issue fixed:

• CVE-2019-3840: Fixed a null pointer dereference vulnerability in virJSONValueObjectHasKey function which could have resulted in a remote denial of service via the guest agent (bsc#1127458).

Other issues addressed:

• apparmor: reintroduce upstream lxc mount rules (bsc#1130129).
• hook: encode incoming XML to UTF-8 before passing to lxml etree from string method (bsc#1123642).
• supportconfig: collect rotated logs in /var/log/libvirt/* (bsc#1124667).
• libxl: support Xen's max_grant_frames setting with maxGrantFrames attribute on the xenbus controller (bsc#1126325).
• conf: added new 'xenbus' controller type
• util: skip RDMA detection for non-PCI network devices (bsc#1112182).
• qemu: don't use CAP_DAC_OVERRIDE capability if non-root (bsc#1125665).
• qemu: fix issues related to restricted permissions on /dev/sev(bsc#1102604).
• apparmor: add support for named profiles (bsc#1118952).
• libxl: save current memory value after successful balloon (bsc#1120813).
• apparmor: Fix ptrace rules. (bsc#1117058)
• libxl: Add support for soft reset. (bsc#1081516)
• libxl: Fix VM migration on busy hosts. (bsc#1108086)
• qemu: Add support for SEV guests. (fate#325817)
• util: Don't check for parallel iteration in hash-related functions. (bsc#1106420)
• spec: Don't restart libvirt-guests when updating libvirt-client. (bsc#1104662)
• Fix virNodeGetSEVInfo API crashing libvirtd on AMD SEV enabled hosts. (bsc#1108395)

This update for libvirt fixes the following issues:

Security issue fixed:

• CVE-2019-3840: Fixed a null pointer dereference vulnerability in virJSONValueObjectHasKey function which could have resulted in a remote denial of service via the guest agent (bsc#1127458).
• CVE-2019-3886: Fixed an information leak which allowed to retrieve the guest hostname under readonly mode (bsc#1131595).

Other issues addressed:

• libxl: support Xen's max_grant_frames setting with maxGrantFrames attribute on the xenbus controller (bsc#1126325).
• conf: added new 'xenbus' controller type
• util: skip RDMA detection for non-PCI network devices (bsc#1112182).
• qemu: don't use CAP_DAC_OVERRIDE capability if non-root (bsc#1125665).
• qemu: fix issues related to restricted permissions on /dev/sev(bsc#1102604).
• libxl: save current memory value after successful balloon (bsc#1120813).
• libxl: Add support for soft reset. (bsc#1081516)

This update for libvirt fixes the following issues:

Security issues fixed:

• CVE-2019-3840: Fixed a null pointer dereference vulnerability in virJSONValueObjectHasKey function which could have resulted in a remote denial of service via the guest agent (bsc#1127458).
• CVE-2019-3886: Fixed an information leak which allowed to retrieve the guest hostname under readonly mode (bsc#1131595).

Other issue addressed:

• cpu: add Skylake-Server and Skylake-Server-IBRS CPU models (FATE#327261, bsc#1131955)
• libxl: save current memory value after successful balloon (bsc#1120813).
• libxl: support Xen's max_grant_frames setting with maxGrantFrames attribute on the xenbus controller (bsc#1126325).
• conf: add new 'xenbus' controller type

It was discovered that libvirt incorrectly handled waiting for certain agent events. An attacker inside a guest could possibly use this issue to cause libvirtd to stop responding, resulting in a denial of service.