Headline
CVE-2022-33743
network backend may cause Linux netfront to use freed SKBs While adding logic to support XDP (eXpress Data Path), a code label was moved in a way allowing for SKBs having references (pointers) retained for further processing to nevertheless be freed.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2022-33743 / XSA-405 version 3 network backend may cause Linux netfront to use freed SKBs UPDATES IN VERSION 3 ==================== Public release. ISSUE DESCRIPTION ================= While adding logic to support XDP (eXpress Data Path), a code label was moved in a way allowing for SKBs having references (pointers) retained for further processing to nevertheless be freed. IMPACT ====== A misbehaving or malicious backend may cause a Denial of Service (DoS) in the guest. Information leaks or privilege escalation cannot be ruled out. VULNERABLE SYSTEMS ================== Linux versions 5.9 - 5.18 are vulnerable. Linux versions 5.8 and earlier are not vulnerable. This vulnerability only increases the capability of an attacker in systems with less than fully privileged network backends (e.g. network driver domains). For systems where netback runs in dom0 (the default configuration), this vulnerability does not increase the capabilities of an attacker. MITIGATION ========== There is no mitigation available other than not using PV devices in case a backend is suspected to be potentially malicious. CREDITS ======= This issue was discovered by Jan Beulich of SUSE. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. Note that patches for released versions are generally prepared to apply to the stable branches, and may not apply cleanly to the most recent release tarball. Downstreams are encouraged to update to the tip of the stable branch before applying these patches. xsa405-linux.patch Linux 5.9 - 5.19-rc $ sha256sum xsa405* 69716b78fbd996bce0414079bbb5f002029c5a82924aaae0db78a13c4b385f0a xsa405-linux.patch $ DEPLOYMENT DURING EMBARGO ========================= Deployment of patches or mitigations is NOT permitted (except where all the affected systems and VMs are administered and used only by organisations which are members of the Xen Project Security Issues Predisclosure List). Specifically, deployment on public cloud systems is NOT permitted. This is because the patches need to be applied in the affected guests. Switching from PV to non-PV devices is observable by the guests and has usually a bad performance impact. Deployment is permitted only AFTER the embargo ends. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team’s decisionmaking.) For more information about permissible uses of embargoed information, consult the Xen Project community’s agreed Security Policy: http://www.xenproject.org/security-policy.html -----BEGIN PGP SIGNATURE----- iQFABAEBCAAqFiEEI+MiLBRfRHX6gGCng/4UyVfoK9kFAmLEFgAMHHBncEB4ZW4u b3JnAAoJEIP+FMlX6CvZgG4H/3KYUQdJlSEq2AEmIZhh1HDdhj/9n9Wxm0eHEqEQ pXvflqbqb2glZpQyWcFPcY4oRRYvy58p9FIEi3PJD+52K/7h58XcTEZKDFP87z53 iqATbN4s/wHQ45xWAuIEHsmfLRtj3gIr4qviux3dtygKMjo6cZDX7Ethv6j0xdgc lEUfvisH+3ZXG+JOQbZyxmi6g1SGDf1TJQczXR1rJjIp/npTupfFO+4r+vpiypbI 6ytFrRwmqfzuO8Mz5Wqrda8Fkk3JYoYtJdBfd/hYNu5vBN0d4o82sbZpuzVgdRI4 H+R90MB1XpZJ/mSYEDBbEctbmTFfJrRvr9yGjtCi8ivvQ5I= =fMa/ -----END PGP SIGNATURE-----
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