rhsa-2021_4648
Vulnerability from csaf_redhat
Published
2021-11-15 10:17
Modified
2024-09-13 22:46
Summary
Red Hat Security Advisory: kernel-rt security and bug fix update
Notes
Topic
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.4 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: Insufficient validation of user-supplied sizes for the MSG_CRYPTO message type (CVE-2021-43267)
* kernel: timer tree corruption leads to missing wakeup and system freeze (CVE-2021-20317)
* kernel: fuse: stall on CPU can occur because a retry loop continually finds the same bad inode (CVE-2021-28950)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Bug Fix(es):
* kernel-rt: update RT source tree to the RHEL-8.4.z5 source tree (BZ#2017122)
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
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"url": "https://access.redhat.com/errata/RHSA-2021:4648"
},
{
"category": "workaround",
"details": "The TIPC module will NOT be automatically loaded. When required, administrative action is needed to explicitly load this module.\n\nLoading the module can be prevented with the following instructions:\n# echo \"install tipc /bin/true\" \u003e\u003e /etc/modprobe.d/disable-tipc.conf\nThe system will need to be restarted if the tipc module is loaded. In most circumstances, the TIPC kernel module will be unable to be unloaded while any network interfaces are active and the protocol is in use.\n\nIf the system requires this module to work correctly, this mitigation may not be suitable.\nIf you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.\n\nTo mitigate the issue on systems that do need to use TIPC and do *not* deploy the TIPC protocol level encryption but rather use different ways to ensure secure communication between nodes (eg. physical network separation, IPSec/MACsec):\n\n- BEWARE THAT THIS WILL DISABLE THE TIPC PROTOCOL LEVEL ENCRYPTION - \n\n1) On the host, save the following in a file with the \".stp\" extension:\n\n%{\n\n#include \u003clinux/skbuff.h\u003e\n\n\n#define MSG_CRYPTO 14\n#define SOCK_WAKEUP 14 /* pseudo user */\n#define TOP_SRV 15 /* pseudo user */\n\n\nstruct tipc_msg {\n __be32 hdr[15];\n};\n\nstatic inline struct tipc_msg *buf_msg(struct sk_buff *skb)\n{\n return (struct tipc_msg *)skb-\u003edata;\n}\n\nstatic inline u32 msg_word(struct tipc_msg *m, u32 pos)\n{\n return ntohl(m-\u003ehdr[pos]);\n}\n\nstatic inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)\n{\n m-\u003ehdr[w] = htonl(val);\n}\n\nstatic inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)\n{\n return (msg_word(m, w) \u003e\u003e pos) \u0026 mask;\n}\n\nstatic inline void msg_set_bits(struct tipc_msg *m, u32 w,\n u32 pos, u32 mask, u32 val)\n{\n val = (val \u0026 mask) \u003c\u003c pos;\n mask = mask \u003c\u003c pos;\n m-\u003ehdr[w] \u0026= ~htonl(mask);\n m-\u003ehdr[w] |= htonl(val);\n}\n\nstatic inline u32 msg_user(struct tipc_msg *m)\n{\n return msg_bits(m, 0, 25, 0xf);\n}\n\nstatic inline void msg_set_user(struct tipc_msg *m, u32 n)\n{\n msg_set_bits(m, 0, 25, 0xf, n);\n}\n\n%}\n\nfunction sanitize:long (skb:long) %{\n struct sk_buff *skb;\n struct tipc_msg *hdr;\n\n#if STAP_COMPAT_VERSION \u003e= STAP_VERSION(1,8)\n skb = (struct sk_buff *) (unsigned long) STAP_ARG_skb;\n#else\n skb = (struct sk_buff *) (unsigned long) THIS-\u003eskb;\n#endif\n\n hdr = buf_msg(skb);\n\n if(msg_user(hdr) == MSG_CRYPTO) {\n msg_set_user(hdr, TOP_SRV); // set to invalid in this context\n }\n\n%}\n\nprobe module(\"tipc\").function(\"tipc_data_input\").call {\n sanitize($skb);\n}\n\n\n2) Install the \"systemtap\" package and any required dependencies (such as\n kernel-devel and kernel-debuginfo packages).\n\n3) Run the \"stap -g [filename-from-step-1].stp\" command as root.\n\nIf the host is rebooted, the changes will be lost and the script must be\nrun again.\n\n\nAlternatively, build the systemtap script on a development system with\n\"stap -g -p 4 [filename-from-step-1].stp\", distribute the resulting kernel\nmodule to all affected systems, and run \"staprun -L \u003cmodule\u003e\" on those.\nWhen using this approach only systemtap-runtime package is required on the\naffected systems. Please notice that the kernel version must be the same across\nall systems.",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: Insufficient validation of user-supplied sizes for the MSG_CRYPTO message type"
}
]
}
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