Bug 1448794 – CVE-2017-8804 glibc: memory leak in sunrpc when decoding malformed XDR

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Bug 1448794 - (CVE-2017-8804) CVE-2017-8804 glibc: memory leak in sunrpc when decoding malformed XDR

Summary:	CVE-2017-8804 glibc: memory leak in sunrpc when decoding malformed XDR

Status:	CLOSED WONTFIX

Aliases:	CVE-2017-8804

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
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Target Release:	---
Assigned To:	Red Hat Product Security
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Whiteboard:	impact=moderate,public=20170508,repor...
Keywords:	Security

Depends On:	1448796
Blocks:	1448130
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Reported:	2017-05-08 03:58 EDT by Doran Moppert
Modified:	2018-08-06 19:54 EDT (History)
CC List:	14 users (show)

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Last Closed:	2017-06-23 01:36:12 EDT
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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Sourceware	21461	None	None	None	2018-08-06 07:47 EDT

Groups: None (edit)

Description Doran Moppert 2017-05-08 03:58:09 EDT

A crafted XDR message containing a string or bytes entity with a particularly large size but no content could cause xdr_opaque to leak virtual memory. Since the memory is never accessed, physical pages are not mapped (unless sysctl vm.overcommit_memory=2 is in effect). This was discovered in the wake of CVE-2017-8779.

Upstream issue:

https://sourceware.org/bugzilla/show_bug.cgi?id=21461

Upstream patch:

https://sourceware.org/ml/libc-alpha/2017-05/msg00105.html

CVE assignment:

https://seclists.org/oss-sec/2017/q2/218

Comment 1 Doran Moppert 2017-05-08 03:59:22 EDT

Created glibc tracking bugs for this issue:

Affects: fedora-all [bug 1448796]

Comment 3 Doran Moppert 2018-08-06 19:54:16 EDT

Per discussion on the libc-alpha mailing list (linked https://sourceware.org/bugzilla/show_bug.cgi?id=21461#c7), this is an application vulnerability rather than a flaw in glibc.  Users of the sunrpc library routines must be careful to use XDR_FREE, even when deserialisation failure occurs.

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