REDHAT-BUG-642896
First published: Thu Oct 14 2010(Updated: )
Description of problem: The handling functions for sending and receiving messages, in rds_page_copy_user(), use the unchecked __copy_*_user_inatomic functions without any access checks on user-provided pointers. As a result, by passing a kernel address as an iovec base address in recvmsg-style calls, a local user can overwrite arbitrary kernel memory, which can easily be used to escalate privileges to root. Introduced via 7875e18e (v2.6.30-rc1). Acknowledgements: Red Hat would like to thank Dan Rosenberg of Virtual Security Research for reporting this issue.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat Linux | >2.6.30-rc1 |
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Reference Links
- http://www.vsecurity.com/resources/advisory/20101019-1/
- http://git.kernel.org/linus/799c10559d60f159ab2232203f222f18fa3c4a5f
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=642896#c10
- https://access.redhat.com/security/cve/CVE-2010-3904
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=645252
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=645305
- https://rhn.redhat.com/errata/RHSA-2010-0792.html
- https://rhn.redhat.com/errata/RHSA-2010-0842.html
- https://bugzilla.redhat.com/show_bug.cgi?id=642896
Frequently Asked Questions
What is the severity of REDHAT-BUG-642896?
The severity of REDHAT-BUG-642896 is considered high due to the risk of exposing kernel memory and potential system compromise.
How do I fix REDHAT-BUG-642896?
To fix REDHAT-BUG-642896, update the Linux Kernel to a version that addresses the improper handling of user-provided pointers.
What are the potential impacts of REDHAT-BUG-642896?
The potential impacts of REDHAT-BUG-642896 include unauthorized access to sensitive kernel memory and potential exploitation by malicious users.
Which versions of Red Hat Linux are affected by REDHAT-BUG-642896?
Red Hat Linux Kernel versions starting from 2.6.30-rc1 are affected by REDHAT-BUG-642896.
Is there a workaround for REDHAT-BUG-642896?
Currently, there is no known workaround for REDHAT-BUG-642896 other than applying the appropriate kernel updates.
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