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CVE-2007-2453

Status Candidate

Overview

The random number feature in Linux kernel 2.6 before 2.6.20.13, and 2.6.21.x before 2.6.21.4, (1) does not properly seed pools when there is no entropy, or (2) uses an incorrect cast when extracting entropy, which might cause the random number generator to provide the same values after reboots on systems without an entropy source.

Related Files

Mandriva Linux Security Advisory 2007.216
Posted Nov 14, 2007
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory - About a half dozen vulnerabilities were discovered and corrected in the Linux 2.6 kernel. These range from buffer overflows to denial of service flaws.

tags | advisory, denial of service, overflow, kernel, vulnerability
systems | linux, mandriva
advisories | CVE-2007-2172, CVE-2007-2242, CVE-2007-2453, CVE-2007-2525, CVE-2007-3105, CVE-2007-4133
MD5 | d8fcfc5806de2fc7a2e7be34ad4f632e
Mandriva Linux Security Advisory 2007.196
Posted Oct 16, 2007
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory - The compat_sys_mount function in fs/compat.c allowed local users to cause a denial of service (NULL pointer dereference and oops) by mounting a smbfs file system in compatibility mode. The nf_conntrack function in netfilter did not set nfctinfo during reassembly of fragmented packets, which left the default value as IP_CT_ESTABLISHED and could allow remote attackers to bypass certain rulesets using IPv6 fragments. A typo in the Linux kernel caused RTA_MAX to be used as an array size instead of RTN_MAX, which lead to an out of bounds access by certain functions. The IPv6 protocol allowed remote attackers to cause a denial of service via crafted IPv6 type 0 route headers that create network amplification between two routers. The random number feature did not properly seed pools when there was no entropy, or used an incorrect cast when extracting entropy, which could cause the random number generator to provide the same values after reboots on systems without an entropy source. A memory leak in the PPPoE socket implementation allowed local users to cause a denial of service (memory consumption) by creating a socket using connect, and releasing it before the PPPIOCGCHAN ioctl is initialized. An integer underflow in the cpuset_tasks_read function, when the cpuset filesystem is mounted, allowed local users to obtain kernel memory contents by using a large offset when reading the /dev/cpuset/tasks file. The sctp_new function in netfilter allowed remote attackers to cause a denial of service by causing certain invalid states that triggered a NULL pointer dereference. A stack-based buffer overflow in the random number generator could allow local root users to cause a denial of service or gain privileges by setting the default wakeup threshold to a value greater than the output pool size. The lcd_write function did not limit the amount of memory used by a caller, which allows local users to cause a denial of service (memory consumption). The Linux kernel allowed local users to send arbitrary signals to a child process that is running at higher privileges by causing a setuid-root parent process to die which delivered an attacker-controlled parent process death signal (PR_SET_PDEATHSIG). The aac_cfg_openm and aac_compat_ioctl functions in the SCSI layer ioctl patch in aacraid did not check permissions for ioctls, which might allow local users to cause a denial of service or gain privileges. The IA32 system call emulation functionality, when running on the x86_64 architecture, did not zero extend the eax register after the 32bit entry path to ptrace is used, which could allow local users to gain privileges by triggering an out-of-bounds access to the system call table using the %RAX register.

tags | advisory, remote, denial of service, overflow, arbitrary, kernel, local, root, protocol, memory leak
systems | linux, mandriva
advisories | CVE-2006-7203, CVE-2007-1497, CVE-2007-2172, CVE-2007-2242, CVE-2007-2453, CVE-2007-2525, CVE-2007-2875, CVE-2007-2876, CVE-2007-3105, CVE-2007-3513, CVE-2007-3848, CVE-2007-4308, CVE-2007-4573
MD5 | c9c788c8ab303f6c67b69c3510264278
Mandriva Linux Security Advisory 2007.171
Posted Aug 29, 2007
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory - Some vulnerabilities have been discovered and corrected in the Linux 2.6 kernel.

tags | advisory, kernel, vulnerability
systems | linux, mandriva
advisories | CVE-2006-5755, CVE-2006-7203, CVE-2007-1496, CVE-2007-1497, CVE-2007-1861, CVE-2007-2172, CVE-2007-2242, CVE-2007-2453, CVE-2007-2525, CVE-2007-2875, CVE-2007-2876
MD5 | 02cc4798552436a0a839fc77777adec4
Debian Linux Security Advisory 1356-1
Posted Aug 16, 2007
Authored by Debian | Site debian.org

Debian Security Advisory 1356-1 - Several local and remote vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or the execution of arbitrary code.

tags | advisory, remote, denial of service, arbitrary, kernel, local, vulnerability
systems | linux, debian
advisories | CVE-2007-1353, CVE-2007-2172, CVE-2007-2453, CVE-2007-2525, CVE-2007-2876, CVE-2007-3513, CVE-2007-3642, CVE-2007-3848, CVE-2007-3851
MD5 | cf012807510b8261551f02c3597097d2
Ubuntu Security Notice 489-1
Posted Jul 20, 2007
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 489-1 - A ridiculous amount of vulnerabilities in the Linux 2.6 kernel have been fixed.

tags | advisory, kernel, vulnerability
systems | linux, ubuntu
advisories | CVE-2006-4623, CVE-2006-7203, CVE-2007-0005, CVE-2007-1000, CVE-2007-1353, CVE-2007-1861, CVE-2007-2453, CVE-2007-2525, CVE-2007-2875, CVE-2007-2876, CVE-2007-2878, CVE-2007-3380, CVE-2007-3513
MD5 | 44760b5f718175c47aece71c76f178d5
Ubuntu Security Notice 486-1
Posted Jul 19, 2007
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 486-1 - The compat_sys_mount function allowed local users to cause a denial of service when mounting a smbfs filesystem in compatibility mode. The Omnikey CardMan 4040 driver (cm4040_cs) did not limit the size of buffers passed to read() and write(). A local attacker could exploit this to execute arbitrary code with kernel privileges. Due to a variable handling flaw in the ipv6_getsockopt_sticky() function a local attacker could exploit the getsockopt() calls to read arbitrary kernel memory. This could disclose sensitive data. Ilja van Sprundel discovered that Bluetooth setsockopt calls could leak kernel memory contents via an uninitialized stack buffer. A local attacker could exploit this flaw to view sensitive kernel information. A flaw was discovered in the handling of netlink messages. Local attackers could cause infinite recursion leading to a denial of service. A flaw was discovered in the IPv6 stack's handling of type 0 route headers. By sending a specially crafted IPv6 packet, a remote attacker could cause a denial of service between two IPv6 hosts. The random number generator was hashing a subset of the available entropy, leading to slightly less random numbers. Additionally, systems without an entropy source would be seeded with the same inputs at boot time, leading to a repeatable series of random numbers. A flaw was discovered in the PPP over Ethernet implementation. Local attackers could manipulate ioctls and cause kernel memory consumption leading to a denial of service. An integer underflow was discovered in the cpuset filesystem. If mounted, local attackers could obtain kernel memory using large file offsets while reading the tasks file. This could disclose sensitive data. Vilmos Nebehaj discovered that the SCTP netfilter code did not correctly validate certain states. A remote attacker could send a specially crafted packet causing a denial of service. Luca Tettamanti discovered a flaw in the VFAT compat ioctls on 64-bit systems. A local attacker could corrupt a kernel_dirent struct and cause a denial of service.

tags | advisory, remote, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2006-7203, CVE-2007-0005, CVE-2007-1000, CVE-2007-1353, CVE-2007-1861, CVE-2007-2242, CVE-2007-2453, CVE-2007-2525, CVE-2007-2875, CVE-2007-2876, CVE-2007-2878
MD5 | d1fbda39809930977b9a5d12439c40b2
Ubuntu Security Notice 470-1
Posted Jun 11, 2007
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 470-1 - Ilja van Sprundel discovered that Bluetooth setsockopt calls could leak kernel memory contents via an uninitialized stack buffer. A local attacker could exploit this flaw to view sensitive kernel information. The GEODE-AES driver did not correctly initialize its encryption key. Any data encrypted using this type of device would be easily compromised. The random number generator was hashing a subset of the available entropy, leading to slightly less random numbers. Additionally, systems without an entropy source would be seeded with the same inputs at boot time, leading to a repeatable series of random numbers.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2007-1353, CVE-2007-2451, CVE-2007-2453
MD5 | aa14eca65f912b2d5e65561a17a896a3
OpenPKG Security Advisory 2007.12
Posted May 21, 2007
Authored by OpenPKG Foundation | Site openpkg.com

OpenPKG Security Advisory - Multiple vulnerabilities were found in the CIFS/SMB server implementation Samba.

tags | advisory, vulnerability
advisories | CVE-2007-2444, CVE-2007-2446, CVE-2007-2447, CVE-2007-2453, CVE-2007-2454
MD5 | ebff442b732d771ea800fb993d82fdaa
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