Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a use-after-free in buffer.c when evbuffer_add_buffer_reference processes an output buffer whose out_total_len is zero. evbuffer_free_all_chains frees the initial empty chain without resetting outbuf->first, outbuf->last, or outbuf->last_with_datap, and APPEND_CHAIN_MULTICAST subsequently dereferences the dangling chain pointer. A caller that can drive this buffer state can cause memory corruption or a process crash. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.
Weakness
The product uses or accesses a resource that has not been initialized.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | RedHat | libevent-0:2.1.13-1.el10_2 | * |
| Red Hat Enterprise Linux 9 | RedHat | libevent-0:2.1.13-1.el9_8 | * |
| Red Hat Enterprise Linux 9 | RedHat | libevent-0:2.1.13-1.el9_8 | * |
| Cert Manager support for Red Hat OpenShift release 1.20 | RedHat | cert-manager/jetstack-cert-manager-rhel9:1790223279 | * |
| Cert Manager support for Red Hat OpenShift release 1.20 | RedHat | cert-manager/cert-manager-istio-csr-rhel9:1790223719 | * |
| Cert Manager support for Red Hat OpenShift release 1.20 | RedHat | cert-manager/cert-manager-operator-rhel9:1790272426 | * |
| Cert Manager support for Red Hat OpenShift release 1.20 | RedHat | cert-manager/jetstack-cert-manager-acmesolver-rhel9:1790589998 | * |
| Cert Manager support for Red Hat OpenShift release 1.20 | RedHat | cert-manager/jetstack-cert-manager-rhel9:1790589912 | * |
| Cert Manager support for Red Hat OpenShift release 1.20 | RedHat | cert-manager/cert-manager-istio-csr-rhel9:1790589914 | * |
| Cert Manager support for Red Hat OpenShift release 1.20 | RedHat | cert-manager/cert-manager-operator-rhel9:1790589855 | * |
| Red Hat Hardened Images | RedHat | libevent-main-2.1.12-19.1.hum1 | * |
| Red Hat Update Infrastructure 5 | RedHat | rhui5/cds-kubernetes-rhel9:1790241897 | * |
| Red Hat Update Infrastructure 5 | RedHat | rhui5/cds-rhel9:1790241954 | * |
| Red Hat Update Infrastructure 5 | RedHat | rhui5/haproxy-rhel9:1790241900 | * |
| Red Hat Update Infrastructure 5 | RedHat | rhui5/installer-rhel9:1790241922 | * |
| Red Hat Update Infrastructure 5 | RedHat | rhui5/rhua-rhel9:1790242004 | * |
| Libevent | Ubuntu | esm-infra/bionic | * |
| Libevent | Ubuntu | esm-infra/focal | * |
| Libevent | Ubuntu | jammy | * |
| Libevent | Ubuntu | noble | * |
| Libevent | Ubuntu | resolute | * |
| Libevent | Ubuntu | upstream | * |
Potential Mitigations
References
- https://github.com/libevent/libevent/commit/5cb95ba2f804f8aff46f88d58391c71e1251cd1c
- https://github.com/libevent/libevent/commit/9db091b04f569be3a700fa9860ef02f90b830af9
- https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable
- https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha
- https://github.com/libevent/libevent/security/advisories/GHSA-c2pj-cg4r-88c8