Bug 1177569 (CVE-2014-9424)

Summary:	CVE-2014-9424 libressl: Double-free in ssl_parse_clienthello_use_srtp_ext() function
Product:	[Other] Security Response	Reporter:	Huzaifa S. Sidhpurwala <huzaifas>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jrusnack, tmraz
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2014-12-29 05:42:08 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Huzaifa S. Sidhpurwala 2014-12-29 05:25:27 UTC

Common Vulnerabilities and Exposures assigned an identifier CVE-2014-9424 to the following vulnerability:

Name: CVE-2014-9424
URL: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9424
Assigned: 20141228
Reference: MISC: https://code.google.com/p/google-security-research/issues/detail?id=202
Reference: CONFIRM: https://github.com/robertbachmann/openbsd-libssl/commit/62a110d447bb8c16a4c69629e28a42e8c39fd7e0

Double free vulnerability in the ssl_parse_clienthello_use_srtp_ext function in d1_srtp.c in LibreSSL before 2.1.2 allows remote attackers to cause a denial of service or possibly have unspecified other impact by triggering a certain length-verification error during processing of a DTLS handshake.

Comment 1 Huzaifa S. Sidhpurwala 2014-12-29 05:41:24 UTC

This flaw arises because an attempt is made to free the "clnt" structure, which has been already freed previously, resulting in a possible double-free issue. (Looks like just Dos, unless clnt could be user-controlled).

OpenSSL code does not contain the vulnerable code. No "clnt" variable exists in the ssl_parse_clienthello_use_srtp_ext() function. 

Statement:

Not vulnerable. This issue does not affect the version of OpenSSL package as shipped with Red Hat Enterprise Linux 5, 6 and 7.

Comment 2 Huzaifa S. Sidhpurwala 2014-12-29 05:42:08 UTC

This issue does not affect the version of OpenSSL package, as shipped in Fedora 19, 20 and 21.