Bug 1252861 (CVE-2015-6565)
| Summary: | CVE-2015-6565 openssh: Incorrectly set TTYs to be world-writable | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Adam Mariš <amaris> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED NOTABUG | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | carnil, jaeshin, jjelen, mattias.ellert, mgrepl, plautrba, rhbugs, santony, sardella, security-response-team, szidek, tmraz |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | openssh 7.0 | Doc Type: | Bug Fix |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2015-09-23 12:58:14 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: | 1252862 | ||
| Bug Blocks: | 1252864 | ||
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Description
Adam Mariš
2015-08-12 11:54:35 UTC
Created openssh tracking bugs for this issue: Affects: fedora-all [bug 1252862] openssh-7.0p1-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report. openssh-6.9p1-5.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report. CVE assignment: http://seclists.org/oss-sec/2015/q3/419 Interesting observation of how to exploit this vulnerability for code execution as the targeted user: http://seclists.org/oss-sec/2015/q3/482 This issue was introduced in the following upstream commit: https://anongit.mindrot.org/openssh.git/commit/sshpty.c?id=a5883d4eccb94b16c355987f58f86a7dee17a0c2 http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshpty.c.diff?r1=1.28&r2=1.29&f=h That commit intentionally changed TTY permissions for systems without the tty group from S_IRUSR | S_IWUSR | S_IWGRP | S_IWOTH (622) to 600, but also unintentionally changed permissions for systems with the tty group from S_IRUSR | S_IWUSR | S_IWGRP (620) to 622. The openssh versions as shipped Red Hat Enterprise Linux 7 and earlier did not include the above incorrect change and hence were not affected by this issue. Statement: This issue did not affect the versions of openssh as shipped with Red Hat Enterprise Linux 5, 6, and 7. |