Bug 1488873 (CVE-2017-11462)
Summary: | CVE-2017-11462 krb5: Automatic sec context deletion could lead to double-free | ||
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Product: | [Other] Security Response | Reporter: | Andrej Nemec <anemec> |
Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
Status: | CLOSED WONTFIX | QA Contact: | |
Severity: | low | Docs Contact: | |
Priority: | low | ||
Version: | unspecified | CC: | abokovoy, apintea, bmaxwell, cdewolf, chazlett, csutherl, darran.lofthouse, dimitris, dosoudil, dpal, fgavrilo, gzaronik, jawilson, jclere, jondruse, jplans, jshepherd, j, lgao, mbabacek, myarboro, nalin, npmccallum, pgier, pjurak, pkis, ppalaga, psakar, pslavice, rharwood, rnetuka, rstancel, rsvoboda, sbose, ssorce, twalsh, vtunka, weli |
Target Milestone: | --- | Keywords: | Security |
Target Release: | --- | ||
Hardware: | All | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | If docs needed, set a value | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2019-02-03 03:18:09 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: | 1488874 | ||
Bug Blocks: | 1667159 |
Description
Andrej Nemec
2017-09-06 11:38:03 UTC
Created krb5 tracking bugs for this issue: Affects: fedora-all [bug 1488874] Analysis: The problem exists in gss_init_sec_context() and gss_accept_sec_context(). These functions delete an existing security context structure, when internal union_ctx_id->internal_ctx_id is set to GSS_C_NO_CONTEXT. This security context structure is a part of a bigger union context, which is later freed. So essentially this results in a double-free. This should not be really exploitable apart from crash. The crash should only occur in rare circumstances when the affected code is hit. |