REDHAT-BUG-649715
First published: Thu Nov 04 2010(Updated: )
Description of problem: packet_getname_spkt() doesn't initialize all members of sa_data field of sockaddr struct if strlen(dev->name) < 13. This structure is then copied to userland. It leads to leaking of contents of kernel stack memory. We have to fully fill sa_data with strncpy() instead of strlcpy(). The same with packet_getname(): it doesn't initialize sll_pkttype field of sockaddr_ll. Set it to zero. Reference: <a href="http://marc.info/?l=linux-netdev&m=128854507220908&w=2">http://marc.info/?l=linux-netdev&m=128854507220908&w=2</a> <a href="http://seclists.org/oss-sec/2010/q4/94">http://seclists.org/oss-sec/2010/q4/94</a> Acknowledgements: Red Hat would like to thank Vasiliy Kulikov of Openwall for reporting this issue.
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Red Hat Linux |
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Reference Links
- http://marc.info/?l=linux-netdev&m=128854507220908&w=2
- http://seclists.org/oss-sec/2010/q4/94
- http://www.redhat.com/security/updates/errata
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=67286640f638f5ad41a946b9a3dc75327950248f
- https://rhn.redhat.com/errata/RHSA-2010-0958.html
- https://rhn.redhat.com/errata/RHSA-2011-0004.html
- https://rhn.redhat.com/errata/RHSA-2011-0007.html
- https://rhn.redhat.com/errata/RHSA-2011-0162.html
- https://bugzilla.redhat.com/show_bug.cgi?id=649715
Frequently Asked Questions
What is the severity of REDHAT-BUG-649715?
The severity of REDHAT-BUG-649715 is considered to be high due to the potential leakage of kernel stack memory.
How do I fix REDHAT-BUG-649715?
To fix REDHAT-BUG-649715, ensure that the sa_data field of the sockaddr struct is fully initialized using strncpy() when copying data to userland.
What systems are affected by REDHAT-BUG-649715?
REDHAT-BUG-649715 affects Red Hat Linux systems that rely on the packet_getname_spkt() function.
What are the potential risks of not addressing REDHAT-BUG-649715?
Failure to address REDHAT-BUG-649715 can lead to unauthorized access to sensitive information stored in kernel memory.
Is there a patch available for REDHAT-BUG-649715?
Yes, Red Hat has released patches to address REDHAT-BUG-649715, and users are encouraged to apply them.
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