Debian Security Advisory
DSA-3170-1 linux -- security update
- Date Reported:
- 23 Feb 2015
- Affected Packages:
- Security database references:
- In Mitre's CVE dictionary: CVE-2013-7421, CVE-2014-7822, CVE-2014-8160, CVE-2014-8559, CVE-2014-9585, CVE-2014-9644, CVE-2014-9683, CVE-2015-0239, CVE-2015-1420, CVE-2015-1421, CVE-2015-1593.
- More information:
Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service, information leaks or privilege escalation.
- CVE-2013-7421 /
It was discovered that the Crypto API allowed unprivileged users to load arbitrary kernel modules. A local user can use this flaw to exploit vulnerabilities in modules that would not normally be loaded.
Akira Fujita found that the splice() system call did not validate the given file offset and length. A local unprivileged user can use this flaw to cause filesystem corruption on ext4 filesystems, or possibly other effects.
Florian Westphal discovered that a netfilter (iptables/ip6tables) rule accepting packets to a specific SCTP, DCCP, GRE or UDPlite port/endpoint could result in incorrect connection tracking state. If only the generic connection tracking module (nf_conntrack) was loaded, and not the protocol-specific connection tracking module, this would allow access to any port/endpoint of the specified protocol.
It was found that kernel functions that iterate over a directory tree can dead-lock or live-lock in case some of the directory entries were recently deleted or dropped from the cache. A local unprivileged user can use this flaw for denial of service.
Andy Lutomirski discovered that address randomisation for the vDSO in 64-bit processes is extremely biased. A local unprivileged user could potentially use this flaw to bypass the ASLR protection mechanism.
Dmitry Chernenkov discovered that eCryptfs writes past the end of the allocated buffer during encrypted filename decoding, resulting in local denial of service.
It was found that KVM did not correctly emulate the x86 SYSENTER instruction. An unprivileged user within a guest system that has not enabled SYSENTER, for example because the emulated CPU vendor is AMD, could potentially use this flaw to cause a denial of service or privilege escalation in that guest.
It was discovered that the open_by_handle_at() system call reads the handle size from user memory a second time after validating it. A local user with the CAP_DAC_READ_SEARCH capability could use this flaw for privilege escalation.
It was found that the SCTP implementation could free an authentication state while it was still in use, resulting in heap corruption. This could allow remote users to cause a denial of service or privilege escalation.
It was found that address randomisation for the initial stack in 64-bit processes was limited to 20 rather than 22 bits of entropy. A local unprivileged user could potentially use this flaw to bypass the ASLR protection mechanism.
For the stable distribution (wheezy), these problems have been fixed in version 3.2.65-1+deb7u2. Additionally this update fixes regressions introduced in versions 3.2.65-1 and 3.2.65-1+deb7u1.
For the upcoming stable distribution (jessie), these problems will be fixed soon (a subset is fixed already).
For the unstable distribution (sid), these problems will be fixed soon (a subset is fixed already).
We recommend that you upgrade your linux packages.
- CVE-2013-7421 / CVE-2014-9644