An issue was discovered in OpenAFS before 1.6.23 and 1.8.x before 1.8.2. Several data types used as RPC input variables were implemented as unbounded array types, limited only by the inherent 32-bit length field to 4 GB. 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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - An issue was discovered in OpenAFS before 1.6.23 and 1.8.x before 1.8.2. Several data types used as RPC     input variables were implemented as unbounded array types, limited only by the inherent 32-bit length     field to 4 GB. 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. (CVE-2018-16949)

Note that Nessus relies on the presence of the package as reported by the vendor.

Several vulnerabilities were discovered in openafs, an implementation of the distributed filesystem AFS. The Common Vulnerabilities and Exposures project identifies the following problems :

  - CVE-2018-16947     Jeffrey Altman reported that the backup tape controller     (butc) process does accept incoming RPCs but does not     require (or allow for) authentication of those RPCs,     allowing an unauthenticated attacker to perform volume     operations with administrator credentials.

  - CVE-2018-16948     Mark Vitale reported that several RPC server routines do     not fully initialize output variables, leaking memory     contents (from both the stack and the heap) to the     remote caller for otherwise-successful RPCs.

  - CVE-2018-16949     Mark Vitale reported that an unauthenticated attacker     can consume large amounts of server memory and network     bandwidth via specially crafted requests, resulting in     denial of service to legitimate clients.

Several security vulnerabilities were discovered in OpenAFS, a distributed file system.

CVE-2018-16947

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.

CVE-2018-16948

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 information leakage.

CVE-2018-16949

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 1.6.9-2+deb8u8.

We recommend that you upgrade your openafs packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
257265	Linux Distros Unpatched Vulnerability : CVE-2018-16949	Nessus	Misc.	high
117675	Debian DSA-4302-1 : openafs - security update	Nessus	Debian Local Security Checks	critical
117640	Debian DLA-1513-1 : openafs security update	Nessus	Debian Local Security Checks	critical

Detections

Analytics

CVE-2018-16949

high

Tenable Plugins

high

critical

critical