Linux Kernel net/子系统CAP_NET_RAW功能信息泄露漏洞

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漏洞ID 1177347 漏洞类型 信息泄露
发布时间 2011-01-06 更新时间 2020-08-14
CVE编号 CVE-2010-3876 CNNVD-ID CNNVD-201101-005
漏洞平台 N/A CVSS评分 1.9
|漏洞来源
https://cxsecurity.com/issue/WLB-2011010119
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-201101-005
|漏洞详情
Linux kernel是美国Linux基金会发布的开源操作系统Linux所使用的内核。NFSv4 implementation是其中的一个分布式文件系统协议。 Linux kernel 2.6.37-rc2之前版本中的net/packet/af_packet.c文件没有正确初始化某个结构体成员。本地用户可以通过利用CAP_NET_RAW功能读取某个可应用结构体的拷贝,从内核栈内存中获取潜在敏感信息。
|漏洞EXP

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.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
---
 net/packet/af_packet.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 3616f27..0856a13 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1719,7 +1719,7 @@ static int packet_getname_spkt(struct socket *sock, struct sockaddr *uaddr,
 	rcu_read_lock();
 	dev = dev_get_by_index_rcu(sock_net(sk), pkt_sk(sk)->ifindex);
 	if (dev)
-		strlcpy(uaddr->sa_data, dev->name, 15);
+		strncpy(uaddr->sa_data, dev->name, 14);
 	else
 		memset(uaddr->sa_data, 0, 14);
 	rcu_read_unlock();
@@ -1742,6 +1742,7 @@ static int packet_getname(struct socket *sock, struct sockaddr *uaddr,
 	sll->sll_family = AF_PACKET;
 	sll->sll_ifindex = po->ifindex;
 	sll->sll_protocol = po->num;
+	sll->sll_pkttype = 0;
 	rcu_read_lock();
 	dev = dev_get_by_index_rcu(sock_net(sk), po->ifindex);
 	if (dev) {
-- 
1.7.0.4

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|参考资料

来源:bugzilla.redhat.com
链接:https://bugzilla.redhat.com/show_bug.cgi?id=649715
来源:www.kernel.org
链接:http://www.kernel.org/pub/linux/kernel/v2.6/testing/ChangeLog-2.6.37-rc2
来源:MLIST
名称:[oss-security]20101104Re:CVErequest:kernelstackinfoleaks
链接:http://openwall.com/lists/oss-security/2010/11/04/5
来源:MLIST
名称:[oss-security]20101102Re:CVErequest:kernelstackinfoleaks
链接:http://openwall.com/lists/oss-security/2010/11/02/9
来源:MLIST
名称:[oss-security]20101102CVErequest:kernelstackinfoleaks
链接:http://openwall.com/lists/oss-security/2010/11/02/7
来源:MLIST
名称:[oss-security]20101102Re:CVErequest:kernelstackinfoleaks
链接:http://openwall.com/lists/oss-security/2010/11/02/12
来源:MLIST
名称:[oss-security]20101102Re:CVErequest:kernelstackinfoleaks
链接:http://openwall.com/lists/oss-security/2010/11/02/10
来源:MLIST
名称:[netdev]20101031[PATCH2/3]net:packet:fixinformationleaktouserland
链接:http://marc.info/?l=linux-netdev&m=128854507220908&w=2
来源:git.kernel.org
链接:http://git.kernel.org/?p=linux/kernel/git/torvalds/l