Vulnerabilities > CVE-2020-8835 - Out-of-bounds Write vulnerability in multiple products
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
In the Linux kernel 5.5.0 and newer, the bpf verifier (kernel/bpf/verifier.c) did not properly restrict the register bounds for 32-bit operations, leading to out-of-bounds reads and writes in kernel memory. The vulnerability also affects the Linux 5.4 stable series, starting with v5.4.7, as the introducing commit was backported to that branch. This vulnerability was fixed in 5.6.1, 5.5.14, and 5.4.29. (issue is aka ZDI-CAN-10780)
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Nessus
NASL family Fedora Local Security Checks NASL id FEDORA_2020-666F3B1AC3.NASL description The 5.5.15 stable kernel update contains a number of important fixes across the tree. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-04-12 modified 2020-04-07 plugin id 135260 published 2020-04-07 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135260 title Fedora 31 : kernel / kernel-headers / kernel-tools (2020-666f3b1ac3) NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2020-5663.NASL description Description of changes: [5.4.17-2011.1.2.el7uek] - ctf: discard CTF from the vDSO (Nick Alcock) [Orabug: 31194036] [5.4.17-2011.1.1.el7uek] - slcan: Don last seen 2020-05-03 modified 2020-04-28 plugin id 136022 published 2020-04-28 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/136022 title Oracle Linux 7 / 8 : Unbreakable Enterprise kernel (ELSA-2020-5663) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-4313-1.NASL description Manfred Paul discovered that the bpf verifier in the Linux kernel did not properly calculate register bounds for certain operations. A local attacker could use this to expose sensitive information (kernel memory) or gain administrative privileges. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-04-12 modified 2020-03-31 plugin id 135029 published 2020-03-31 reporter Ubuntu Security Notice (C) 2020 Canonical, Inc. / NASL script (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135029 title Ubuntu 18.04 LTS / 19.10 : linux, linux-aws, linux-azure, linux-azure-5.3, linux-gcp, linux-gcp-5.3, (USN-4313-1) NASL family Fedora Local Security Checks NASL id FEDORA_2020-73C00EDA1C.NASL description The 5.5.16 stable kernel update contains a number of important fixes across the tree. ---- The 5.5.15 stable kernel update contains a number of important fixes across the tree. ---- The 5.5.13 stable kernel update contains a number of important fixes across the tree. ---- The 5.5.11 stable kernel update contains a number of important fixes across the tree. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora update system website. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-04-30 modified 2020-04-16 plugin id 135598 published 2020-04-16 reporter This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/135598 title Fedora 30 : kernel / kernel-headers / kernel-tools (2020-73c00eda1c)
References
- http://www.openwall.com/lists/oss-security/2021/07/20/1
- http://www.openwall.com/lists/oss-security/2021/07/20/1
- https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef
- https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f2d67fec0b43edce8c416101cdc52e71145b5fef
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F7OONYGMSYBEFHLHZJK3GOI5Z553G4LD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TF4PQZBEPNXDSK5DOBMW54OCLP25FTCD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TF4PQZBEPNXDSK5DOBMW54OCLP25FTCD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YXBWSHZ6DJIZVXKXGZPK6QPFCY7VKZEG/
- https://lore.kernel.org/bpf/20200330160324.15259-1-daniel%40iogearbox.net/T/
- https://lore.kernel.org/bpf/20200330160324.15259-1-daniel%40iogearbox.net/T/
- https://security.netapp.com/advisory/ntap-20200430-0004/
- https://security.netapp.com/advisory/ntap-20200430-0004/
- https://usn.ubuntu.com/4313-1/
- https://usn.ubuntu.com/4313-1/
- https://usn.ubuntu.com/usn/usn-4313-1
- https://usn.ubuntu.com/usn/usn-4313-1
- https://www.openwall.com/lists/oss-security/2020/03/30/3
- https://www.openwall.com/lists/oss-security/2020/03/30/3
- https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results
- https://www.thezdi.com/blog/2020/3/19/pwn2own-2020-day-one-results