[QSA-1009202] Security Update Bundle
Qlustar Security Advisory 1009202
October 9th, 2020
A Qlustar security update bundle is a cumulative update of packages that are taken from upstream Debian/Ubuntu without modification. Only packages that are used in a typical HPC/Storage cluster installation are mentioned in Qlustar Security Advisories. Other non-HPC related updates also enter the Qlustar repository, but their functionality is not separately verified by the Qlustar team. To track these updates subscribe to the general security mailing lists of Debian/Ubuntu and/or CentOS.
Package(s) : see upstream description of individual package Qlustar releases : 10.1, 11.0 Affected versions: All versions prior to this update Vulnerability : see upstream description of individual package Problem type : see upstream description of individual package Qlustar-specific : no CVE Id(s) : see upstream description of individual package
This update includes several security related package updates from Debian/Ubuntu and CentOS. The following list provides references to the upstream security report of the corresponding packages. You can view the original upstream advisory by clicking on the corresponding title.
Relevant to Qlustar 11.0 and 10.1
It was discovered that the umount bash completion script shipped in util-linux incorrectly handled certain mountpoints. If a local attacker were able to create arbitrary mountpoints, another user could be tricked into executing arbitrary code when attempting to run the umount command with bash completion.
Ziming Zhang, Xiao Wei, Gonglei Arei, and Yanyu Zhang discovered that QEMU incorrectly handled certain USB packets. An attacker inside the guest could use this issue to cause QEMU to crash, resulting in a denial of service, or possibly execute arbitrary code on the host. In the default installation, when QEMU is used with libvirt, attackers would be isolated by the libvirt AppArmor profile.
Tom Tervoort discovered that the Netlogon protocol implemented by Samba incorrectly handled the authentication scheme. A remote attacker could use this issue to forge an authentication token and steal the credentials of the domain admin.
This update fixes the issue by changing the "server schannel" setting to default to "yes", instead of "auto", which will force a secure netlogon channel. This may result in compatibility issues with older devices. A future update may allow a finer-grained control over this setting.
Robert Merget, Marcus Brinkmann, Nimrod Aviram, and Juraj Somorovsky discovered that certain Diffie-Hellman ciphersuites in the TLS specification and implemented by OpenSSL contained a flaw. A remote attacker could possibly use this issue to eavesdrop on encrypted communications. This was fixed in this update by removing the insecure ciphersuites from OpenSSL.
Cesar Pereida García, Sohaib ul Hassan, Nicola Tuveri, Iaroslav Gridin, Alejandro Cabrera Aldaya, and Billy Brumley discovered that OpenSSL incorrectly handled ECDSA signatures. An attacker could possibly use this issue to perform a timing side-channel attack and recover private ECDSA keys.
Guido Vranken discovered that OpenSSL incorrectly performed the x86_64 Montgomery squaring procedure. While unlikely, a remote attacker could possibly use this issue to recover private keys.
Bernd Edlinger discovered that OpenSSL incorrectly handled certain decryption functions. In certain scenarios, a remote attacker could possibly use this issue to perform a padding oracle attack and decrypt traffic.
It was discovered that NSS incorrectly handled some inputs. An attacker could possibly use this issue to expose sensitive information.
CentOS 7.8 / 8.1 security updates
Please check the CentOS mailing list for details about CentOS 7/8 updates that entered this release (everything from Aug 21st to Oct 9th, 2020).
The problem can be corrected by updating your system to the following Qlustar package versions in addition to the package versions mentioned in the upstream reports (follow the Qlustar Update Instructions and on Qlustar 11 also perform the manual steps '7. Migration to GRUB PXE booting' and '10. Adjust root bash shell initialization' as described in the Release Notes if you haven't done so yet):
For Qlustar 11.0
qlustar-module-core-bionic-amd64-11.0.1 126.96.36.199-b522f1314 qlustar-module-core-centos7-amd64-11.0.1 188.8.131.52-b522f1314
For Qlustar 10.1