Buffer overflow in certain client utilities in OpenAFS before 1.6.2 allows remote authenticated users to cause a denial of service (crash) and possibly execute arbitrary code via a long fileserver ACL entry.

Multiple vulnerabilities has been found and corrected in openafs :

Buffer overflow in certain client utilities in OpenAFS before 1.6.2 allows remote authenticated users to cause a denial of service (crash) and possibly execute arbitrary code via a long fileserver ACL entry (CVE-2013-1794).

Integer overflow in ptserver in OpenAFS before 1.6.2 allows remote attackers to cause a denial of service (crash) via a large list from the IdToName RPC, which triggers a heap-based buffer overflow (CVE-2013-1795).

OpenAFS before 1.4.15, 1.6.x before 1.6.5, and 1.7.x before 1.7.26 uses weak encryption (DES) for Kerberos keys, which makes it easier for remote attackers to obtain the service key (CVE-2013-4134).

The vos command in OpenAFS 1.6.x before 1.6.5, when using the -encrypt option, only enables integrity protection and sends data in cleartext, which allows remote attackers to obtain sensitive information by sniffing the network (CVE-2013-4135).

Buffer overflow in the GetStatistics64 remote procedure call (RPC) in OpenAFS 1.4.8 before 1.6.7 allows remote attackers to cause a denial of service (crash) via a crafted statsVersion argument (CVE-2014-0159).

A denial of service flaw was found in libxml2, a library providing support to read, modify and write XML and HTML files. A remote attacker could provide a specially crafted XML file that, when processed by an application using libxml2, would lead to excessive CPU consumption (denial of service) based on excessive entity substitutions, even if entity substitution was disabled, which is the parser default behavior (CVE-2014-3660).

The updated packages have been upgraded to the 1.4.15 version and patched to correct these issues.

The remote host is affected by the vulnerability described in GLSA-201404-05 (OpenAFS: Multiple vulnerabilities)

    Multiple vulnerabilities have been discovered in OpenAFS. Please review       the CVE identifiers referenced below for details.
  Impact :

    An attacker could potentially execute arbitrary code with the       permissions of the user running the AFS server, cause a Denial of Service       condition, or gain access to sensitive information. Additionally, an       attacker could compromise a cell&rsquo;s private key, allowing them to       impersonate any user in the cell.
  Workaround :

    There is no known workaround at this time.

Nickolai Zeldovich reports :

An attacker with the ability to manipulate AFS directory ACLs may crash the fileserver hosting that volume. In addition, once a corrupt ACL is placed on a fileserver, its existence may crash client utilities manipulating ACLs on that server.

By carefully crafting an ACL entry an attacker may overflow fixed length buffers within the OpenAFS fileserver, crashing the fileserver, and potentially permitting the execution of arbitrary code. To perform the exploit, the attacker must already have permissions to create ACLs on the fileserver in question. Once such an ACL is present on a fileserver, client utilities such as 'fs' which manipulate ACLs, may be crashed when they attempt to read or modify the ACL.(CVE-2013-1794)

The ptserver accepts a list of unbounded size from the IdToName RPC.
The length of this list is then used to determine the size of a number of other internal data structures. If the length is sufficiently large then we may hit an integer overflow when calculating the size to pass to malloc, and allocate data structures of insufficient length, allowing heap memory to be overwritten. This may allow an unauthenticated attacker to crash an OpenAFS ptserver. (CVE-2013-1795)

Scientific Linux 5 users must also update to at least kernel-2.6.18-308.20.1.el5 to receive a compatible kernel module.

Scientific Linux 6 users must also update to at least kernel-2.6.32-279.el6 to avoid issues with system stability. Any 32-bit SL6 system should be aware of possible problems with the afs cache when switching from kernels prior to kernel-2.6.32-279.el6.
Purging your OpenAFS cache seems to resolve this issue.

After installing the update, OpenAFS services must be restarted for the changes to take effect.

Multiple buffer overflows were discovered in OpenAFS, the implementation of the distributed filesystem AFS, which might result in denial of service or the execution of arbitrary code. Further information is available at http://www.openafs.org/security.

ID	Name	Product	Family	Severity
79989	Mandriva Linux Security Advisory : openafs (MDVSA-2014:244)	Nessus	Mandriva Local Security Checks	high
73394	GLSA-201404-05 : OpenAFS: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	critical
66769	FreeBSD : net/openafs -- buffer overflow (0bf376b7-cc6b-11e2-a424-14dae938ec40)	Nessus	FreeBSD Local Security Checks	medium
65021	Scientific Linux Security Update : openafs on SL5.x SL6.x i386/x86_64 (20130304)	Nessus	Scientific Linux Local Security Checks	medium
64996	Debian DSA-2638-1 : openafs - buffer overflow	Nessus	Debian Local Security Checks	medium

Detections

Analytics

CVE-2013-1794

high

Tenable Plugins

high

critical

medium

medium

medium