high
7.8
CWE
59
Advisory Published
CVE Published
Advisory Published
Updated

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 SoftwareAffected VersionHow to fix
Sos Project Sos>=3.0<=3.8
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=15.04
Canonical 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
pip/sosreport>=3.0<3.3
3.3

Remedy

https://github.com/sosreport/sos/issues/696

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