Bug 1536661 (CVE-2018-5764)

Summary: CVE-2018-5764 rsync: sanitization bypass in parse_argument in options.c
Product: [Other] Security Response Reporter: Laura Pardo <lpardo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: code, dkholia, gscott, luhliari, mruprich, pebarbos, security-response-team, slawomir, ssorce, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: rsync 3.1.3 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2018-01-30 18:38:13 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:
Bug Depends On: 1536662, 1540312    
Bug Blocks: 1536665    

Description Laura Pardo 2018-01-19 20:57:42 UTC 
A flaw was found in rsync verions before 3.1.3. The parse_argument function in options.c in rsyncd component does not prevent multiple --protect-args uses. Thus letting the user to specify the arg in the protected-arg list and shortcut some of the arg-sanitizing code. This vulnerability allows remote attackers to bypass the argument-sanitization protection mechanism, which may lead to a privilege escalation vulnerability.


References:
https://download.samba.org/pub/rsync/src-previews/rsync-3.1.3pre1-NEWS

Patch:
https://git.samba.org/rsync.git/?p=rsync.git;a=commit;h=7706303828fcde524222babb2833864a4bd09e07
Comment 1 Laura Pardo 2018-01-19 20:58:34 UTC 
Created rsync tracking bugs for this issue:

Affects: fedora-all [bug 1536662]
Comment 3 Pedro Yóssis Silva Barbosa 2018-01-30 18:37:46 UTC 
Statement:

This issue affects the versions of rsync as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise Linux 6. Red Hat Product Security has rated this issue as having Moderate security impact. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.