Bug 1950515 (CVE-2021-3541)
| Summary: | CVE-2021-3541 libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Pedro Sampaio <psampaio> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | csutherl, dking, erik-fedora, fedora, gzaronik, igor.raits, jclere, jorton, jwon, kaycoth, krathod, ktietz, mturk, ohudlick, pjindal, rh-spice-bugs, rjones, security-response-team, szappis, tkorbar, veillard, vmugicag |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | libxml2 2.9.11 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-06-29 16:40:49 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1958781, 1958782, 1958783, 1958784, 1960153, 1960154 | ||
| Bug Blocks: | 1950516, 1964977, 1966964 | ||
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Description
Pedro Sampaio
2021-04-16 19:06:00 UTC
Acknowledgments: Name: Sebastian Pipping This flaw is essentially a variant of the billion laughs attack which can DoS libxml2 even with the set of safe flags. The original billion laughs attack was fixed in libxml2 via https://access.redhat.com/security/cve/CVE-2003-1564 Expat packages shipped in Red Hat products and the upstream project are still vulnerable to billion laughs attack. Created libxml2 tracking bugs for this issue: Affects: fedora-all [bug 1960153] Created mingw-libxml2 tracking bugs for this issue: Affects: fedora-all [bug 1960154] Upstream patch: https://gitlab.gnome.org/GNOME/libxml2/-/commit/8598060bacada41a0eb09d95c97744ff4e428f8e Upstream bug: https://gitlab.gnome.org/GNOME/libxml2/-/issues/228 (currently private) This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:2569 https://access.redhat.com/errata/RHSA-2021:2569 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-3541 This issue has been addressed in the following products: Red Hat JBoss Core Services Via RHSA-2022:1390 https://access.redhat.com/errata/RHSA-2022:1390 This issue has been addressed in the following products: JBoss Core Services on RHEL 7 JBoss Core Services for RHEL 8 Via RHSA-2022:1389 https://access.redhat.com/errata/RHSA-2022:1389 |