| Summary: | Kernel : nfs: missing check for buffer length in __nfs4_get_acl_uncached (CVE-2013-4591) | ||
|---|---|---|---|
| Product: | Gentoo Security | Reporter: | Agostino Sarubbo <ago> |
| Component: | Kernel | Assignee: | Gentoo Kernel Security <security-kernel> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | kernel |
| Priority: | Normal | ||
| Version: | unspecified | ||
| Hardware: | All | ||
| OS: | Linux | ||
| URL: | https://bugzilla.redhat.com/show_bug.cgi?id=1031678 | ||
| Whiteboard: | |||
| Package list: | Runtime testing required: | --- | |
CVE-2013-4591 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2013-4591): Buffer overflow in the __nfs4_get_acl_uncached function in fs/nfs/nfs4proc.c in the Linux kernel before 3.7.2 allows local users to cause a denial of service (memory corruption and system crash) or possibly have unspecified other impact via a getxattr system call for the system.nfs4_acl extended attribute of a pathname on an NFSv4 filesystem. Fix in 3.7.2 |
From ${URL} : Commit 1f1ea6c (included in Red Hat Enterprise Linux 6 as part of CVE-2012-2375 fix) accidently dropped the checking for too small result buffer length. If someone uses getxattr on "system.nfs4_acl" on an NFSv4 mount supporting ACLs, the ACL has not been cached and the buffer suplied is too short, we still copy the complete ACL, resulting in kernel and user space memory corruption. Introduced by: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1f1ea6c2d9d8c0be9ec56454b05315273b5de8ce Upstream commit: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7d3e91a89b7adbc2831334def9e494dd9892f9af