CVE-2015-7529
First published: Mon Nov 16 2015(Updated: )
A vulnerability in sosreport was reported, allowing a privilege escalation to unprivileged attacker on RHEL-6, and change the owner and content of certain files on RHEL-7. sosreport creates temporary directory in /tmp with predictable name sosreport-$hostname-$date with permissions set to 700. Then it creates a tar file with the aforementioned name + .tar suffix. Further it invokes open() with no O_NOFOLLOW nor O_EXCL set, which can be exploited by placing a file or a symlink in its place. Attacker can create his own file to steal the content or can create a symlink to create/modify arbitrary files. On RHEL-7, there is fs.protected_symlinks sysctl provided, which closes this vector. With the setting target of the symlink must match symlink's owner. On RHEL-6 this feature is missing, so the attacker is able to modify arbitrary files and escalate privileges.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/sosreport | >=3.0<3.3 | 3.3 |
| sos project sos | >=3.0<=3.8 | |
| Ubuntu Linux | =14.04 | |
| Ubuntu Linux | =15.04 | |
| Ubuntu Linux | =15.10 | |
| redhat enterprise Linux desktop | =6.0 | |
| redhat enterprise Linux desktop | =7.0 | |
| redhat enterprise Linux server | =6.0 | |
| redhat enterprise Linux server | =7.0 | |
| redhat enterprise Linux server aus | =7.2 | |
| redhat enterprise Linux server aus | =7.3 | |
| redhat enterprise Linux server aus | =7.4 | |
| redhat enterprise Linux server aus | =7.6 | |
| redhat enterprise Linux server aus | =7.7 | |
| redhat enterprise Linux server eus | =6.7 | |
| redhat enterprise Linux server eus | =7.2 | |
| redhat enterprise Linux server eus | =7.3 | |
| redhat enterprise Linux server eus | =7.4 | |
| redhat enterprise Linux server eus | =7.5 | |
| redhat enterprise Linux server eus | =7.6 | |
| redhat enterprise Linux server eus | =7.7 | |
| redhat enterprise Linux server tus | =7.2 | |
| redhat enterprise Linux server tus | =7.3 | |
| redhat enterprise Linux server tus | =7.6 | |
| redhat enterprise Linux server tus | =7.7 | |
| redhat enterprise Linux workstation | =6.0 | |
| redhat enterprise Linux workstation | =7.0 |
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Reference Links
- https://nvd.nist.gov/vuln/detail/CVE-2015-7529
- https://github.com/sosreport/sos/issues/696
- https://access.redhat.com/errata/RHSA-2016:0152
- https://access.redhat.com/errata/RHSA-2016:0188
- https://bugzilla.redhat.com/show_bug.cgi?id=1282542
- http://rhn.redhat.com/errata/RHSA-2016-0152.html
- http://rhn.redhat.com/errata/RHSA-2016-0188.html
- http://www.ubuntu.com/usn/USN-2845-1
- https://access.redhat.com/security/cve/CVE-2015-7529
- https://web.archive.org/web/20160416033632/http://www.securityfocus.com/bid/83162
- https://github.com/advisories/GHSA-3g56-2hh3-35ph (Advisory)
- http://www.securityfocus.com/bid/83162
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1097279&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1097279&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1097280&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1097280&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1097281&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1097281&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1097283&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1097283&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1286934
- https://rhn.redhat.com/errata/RHSA-2016-0152.html
- https://rhn.redhat.com/errata/RHSA-2016-0188.html
- https://github.com/pypa/advisory-database/tree/main/vulns/sosreport/PYSEC-2017-73.yaml
- agent/author
- agent/type
- agent/first-publish-date
- collector/mitre-cve
- source/MITRE
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