medium
4.9
CWE
190
Advisory Published
CVE Published
Updated

CVE-2011-1593: Integer Overflow

First published: Tue Apr 19 2011(Updated: )

A signedness issue has been found in next_pidmap() function when the "last" parameter is negative as next_pidmap() just quietly accepted whatever "last" pid that was passed in, which is not all that safe when one of the users is /proc. Setting f_pos to negative value when accessing /proc via readdir()/getdents() resulted in sign extension of this value when map pointer was being constructed. This later lead to #GP becasue the final pointer was not cannonical (x86_64). map = &amp;pid_ns-&gt;pidmap[(last + 1)/BITS_PER_PAGE]; ffffffff810ac3b4: 48 63 f6 movslq %esi,%rsi &lt;- sign extension (f_pos+-) ffffffff810ac3b7: 81 e2 ff 7f 00 00 and $0x7fff,%edx ffffffff810ac3bd: 48 c1 ee 0f shr $0xf,%rsi ffffffff810ac3c1: 48 c1 e6 04 shl $0x4,%rsi ffffffff810ac3c5: 48 8d 5c 37 08 lea 0x8(%rdi,%rsi,1),%rbx ... if (unlikely(!map-&gt;page)) ffffffff810ac3cc: 48 8b 7b 08 mov 0x8(%rbx),%rdi &lt;- #GP Only x86_64 architecture seems to be vulnerable to this particular issue (tested ppc64, s390x, ia64). Reference: <a href="http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/93c1088451fd3522/4a28ecb7f755a88d?#4a28ecb7f755a88d">http://groups.google.com/group/fa.linux.kernel/browse_thread/thread/93c1088451fd3522/4a28ecb7f755a88d?#4a28ecb7f755a88d</a> Upstream commit: <a href="http://git.kernel.org/linus/c78193e9">http://git.kernel.org/linus/c78193e9</a> <a href="http://git.kernel.org/linus/d8bdc59f">http://git.kernel.org/linus/d8bdc59f</a> Acknowledgements: Red Hat would like to thank Robert Swiecki for reporting this issue.

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
debian/linux-2.6
Linux Kernel<2.6.38.4
Red Hat Enterprise Linux=5.0
redhat enterprise linux aus=5.6
redhat enterprise Linux desktop=5.0
redhat enterprise Linux eus=5.6
redhat enterprise Linux server=5.0
redhat enterprise Linux workstation=5.0
Ubuntu Linux=8.04

Remedy

http://openwall.com/lists/oss-security/2011/04/19/1

Remedy

http://openwall.com/lists/oss-security/2011/04/20/1

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=697822

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2011-1593?

    CVE-2011-1593 is classified as a medium severity vulnerability due to its potential impact on system security.

  • How do I fix CVE-2011-1593?

    To mitigate CVE-2011-1593, users should upgrade to a version of the Linux kernel that is beyond 2.6.38.4.

  • Who is affected by CVE-2011-1593?

    CVE-2011-1593 affects users of Linux kernel versions prior to 2.6.38.4, particularly those running older distributions of Red Hat Enterprise Linux and Ubuntu.

  • What type of vulnerability is CVE-2011-1593?

    CVE-2011-1593 is a signedness issue found in the next_pidmap() function of the Linux kernel.

  • Can CVE-2011-1593 be exploited remotely?

    CVE-2011-1593 can be exploited if an attacker has local access to the vulnerable system, increasing the risk of privilege escalation.

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