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

Affected SoftwareAffected VersionHow to fix
pip/sosreport>=3.0<3.3
3.3
Sos-collector>=3.0<=3.8
Ubuntu=14.04
Ubuntu=15.04
Ubuntu=15.10
Red Hat Enterprise Linux Desktop=6.0
Red Hat Enterprise Linux Desktop=7.0
Red Hat Enterprise Linux Server=6.0
Red Hat Enterprise Linux Server=7.0
Red Hat Enterprise Linux Server=7.2
Red Hat Enterprise Linux Server=7.3
Red Hat Enterprise Linux Server=7.4
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Server=6.7
Red Hat Enterprise Linux Server=7.2
Red Hat Enterprise Linux Server=7.3
Red Hat Enterprise Linux Server=7.4
Red Hat Enterprise Linux Server=7.5
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Server=7.2
Red Hat Enterprise Linux Server=7.3
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Workstation=6.0
Red Hat Enterprise Linux Workstation=7.0

Remedy

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

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2015-7529?

    CVE-2015-7529 is classified as a privilege escalation vulnerability affecting certain versions of sosreport.

  • How do I fix CVE-2015-7529?

    To mitigate CVE-2015-7529, you should update the sosreport package to version 3.4 or later.

  • Which systems are vulnerable to CVE-2015-7529?

    CVE-2015-7529 affects Red Hat Enterprise Linux 6 and 7, as well as Ubuntu 14.04, 15.04, and 15.10.

  • What types of attacks can exploit CVE-2015-7529?

    An unprivileged attacker can exploit CVE-2015-7529 to change ownership and content of certain files.

  • What is the impact of CVE-2015-7529?

    The impact of CVE-2015-7529 includes the ability for an attacker to escalate privileges and manipulate files on affected systems.

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