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AUSCERT External Security Bulletin Redistribution
[SECURITY] [DLA 1513-1] openafs security update
24 September 2018
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2018-16949 CVE-2018-16948 CVE-2018-16947
Comment: This advisory references vulnerabilities in products which run on
platforms other than Debian. It is recommended that administrators
running openafs check for an updated version of the software for
their operating system.
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Package : openafs
Version : 1.6.9-2+deb8u8
CVE ID : CVE-2018-16947 CVE-2018-16948 CVE-2018-16949
Debian Bug : 908616
Several security vulnerabilities were discovered in OpenAFS, a
distributed file system.
The backup tape controller process accepts incoming RPCs but does
not require (or allow for) authentication of those RPCs. Handling
those RPCs results in operations being performed with administrator
credentials, including dumping/restoring volume contents and
manipulating the backup database.
Several RPC server routines did not fully initialize their output
variables before returning, leaking memory contents from both the
stack and the heap. Because the OpenAFS cache manager functions as
an Rx server for the AFSCB service, clients are also susceptible to
Several data types used as RPC input variables were implemented as
unbounded array types, limited only by the inherent 32-bit length
field to 4GB. An unauthenticated attacker could send, or claim to
send, large input values and consume server resources waiting for
those inputs, denying service to other valid connections.
For Debian 8 "Jessie", these problems have been fixed in version
We recommend that you upgrade your openafs packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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