Bug 885724 (CVE-2012-5644)
| Summary: | CVE-2012-5644 libuser: (Complete) Information disclosure when moving user's home directory | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Jan Lieskovsky <jlieskov> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED WONTFIX | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | fweimer, mitr, security-response-team, sonu.khan |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2015-08-22 16:06:04 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: | 928846 | ||
| Bug Blocks: | 884691, 1802635 | ||
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Description
Jan Lieskovsky
2012-12-10 13:41:13 UTC
This issue affects the versions of the libuser package, as shipped with Red Hat Enterprise Linux 5 and 6. -- This issue affects the versions of the libuser package, as shipped with Fedora release of 16 and 17. This issue was assigned CVE-2012-5644 Created libuser tracking bugs for this issue Affects: fedora-all [bug 928846] CVE-2012-5630 and CVE-2012-5644 were addressed upstream via the following set of commits (This also includes a some code refactoring, functionality changes and some minor cleanups): https://fedorahosted.org/libuser/changeset?reponame=&old=cd5a8babd110b138d40fe0d51da2e7d18069eca6%40&new=4a8a1c1c5cf4611bfbdb5d23b51b1a4110112b97%40 https://fedorahosted.org/libuser/changeset?reponame=&old=ae3646e9ed8acea5aa64b4c35f8e2e015696093c%40&new=d094070cab7f717a5d2b17bde0a4795fab9d7239%40 Minimal backport to fedora version of libuser avoiding other code cleanups: http://pkgs.fedoraproject.org/cgit/libuser.git/tree/libuser-dirtree-TOCTOU-fix.patch?id=78a55bf498cac0b430ba6512654860c39dfd0bf9 Statement: Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/. Is there any steps for mitigation that we can apply for a workaround? Also share steps for reproduction. (In reply to Sonu Khan from comment #11) > Is there any steps for mitigation that we can apply for a workaround? > Also share steps for reproduction. I don’t think we typically share reproducers, anyway please contact Product Security at secalert . Mitigation: There are several restrictions to successful exploitation of this flaw: ~~~ 1. ONLY applications compiled with libuser are affected. The affected code is hit only when a move operation is conducted on user home directory. 2. The attacker needs to have a shell account on the target machine. 3. Since this is a TOCTOU attack, precise timing is required for the attack. The attacker needs to know exactly when the move directory is moved in order successfully exploit this flaw. ~~~ Any other application acting on user directories (not compiled with libuser) for example usermod/userdel are not affected by this flaw. |