Title: Linux Kernel Setsockopt MCAST_MSFILTER Integer Overflow Vulnerability
Severity: HIGH
Description:
An integer-overflow vulnerability has been reported in the 'setsockopt()' system call. This issue is related to the code for handling the MCAST_MSFILTER socket option, which is used to provide the kernel with a list of multicast addresses to be received on the socket. This was introduced as of the 2.4.22/2.6.1 kernel releases.
The specific issue resides in the 'net/ipv4/ip_sockglue.c' source file and is present in the 'ip_setsockopt()' subroutine of the 'setsockopt() system' call. Within this subroutine, an integer overflow occurs within the IP_MSFILTER_SIZE macro, which is used when setting the MCAST_MSFILTER socket option. In particular, the value for the IP_MSFILTER_SIZE macro is used as a length argument when allocating kernel memory. A subsequent 'for' loop could cause kernel memory to be overwritten with arbitrary values that have been specified by the attacker. In this way, an unprivileged user could overwrite kernel structures.
A local attacker may exploit this issue to compromise the system or cause a denial of service. Note that this type of vulnerability may provide a generic means of privilege escalation across Linux distributions after a remote attacker has gained unauthorized access as a lower-privileged user.
Affected Products:
- Devil-Linux Devil-Linux 1.0.4
- Devil-Linux Devil-Linux 1.0.5
- Linux kernel 2.4.22
- Linux kernel 2.4.23
- Linux kernel 2.4.23 -ow2
- Linux kernel 2.4.23 -pre9
- Linux kernel 2.4.24
- Linux kernel 2.4.24 -ow1
- Linux kernel 2.4.25
- Linux kernel 2.6.1
- Linux kernel 2.6.1 -rc1
- Linux kernel 2.6.1 -rc2
- Linux kernel 2.6.2
- Linux kernel 2.6.3
- MandrakeSoft Linux Mandrake 9.2.0
- MandrakeSoft Linux Mandrake 9.2.0 amd64
- RedHat Fedora Core1
- SGI ProPack 3.0.0
- Slackware Linux -current
- Slackware Linux 9.1.0
- Trustix Secure Linux 2.0.0
References:
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