Bug 1662705 (CVE-2018-20483)
| Summary: | CVE-2018-20483 wget: Information exposure in set_file_metadata function in xattr.c | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Pedro Sampaio <psampaio> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | abhgupta, dbaker, huzaifas, john.j5live, jokerman, kdudka, paul, sthangav, thozza, trankin |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | wget 1.20.1 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2019-11-06 00:51:34 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: | 1662833, 1662834, 1662851, 1662852 | ||
| Bug Blocks: | 1662706 | ||
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Description
Pedro Sampaio
2018-12-31 21:09:50 UTC
Analysis notes: The security flaw exists in the way wget caches credentials passed as a part of the URL, in the extended attributes of the downloaded file. For example: $ wget https://user1:redhat@localhost [..] Saving to: ‘index.html’ index.html [ <=> ] 0 --.-KB/s in 0s $ getfattr -n user.xdg.origin.url index.html # file: index.html user.xdg.origin.url="https://user1:redhat@localhost/" However credentials passed to wget using the "--user"/"--password" command line parameters are not cached. Similarly when "--user"/"--ask-password" is used which prompts the user to enter password on the command line (hereby preventing the password appearing in the command line history), the credentials will not be cached. Further to this wget already has a command line flags called "--no-xattr" which when used will turn off storage of metadata in extended file attributes. The patch applied by upstream ensures that: 1. --no-xattr is the default behaviour and storing of extended attributes can be turned on by the user using the new --xattr flag. 2. By default no username/passwords are not saved in the file extended attributes. External References: http://git.savannah.gnu.org/cgit/wget.git/tree/NEWS Support for storing extended attribute information was added to wget in version 1.19 using the following commit: http://git.savannah.gnu.org/cgit/wget.git/commit/?id=a933bdd31eee9c956a3b5cc142f004ef1fa94cb3 Therefore this issue does not affect the version of wget shipped with Red Hat Enterprise Linux 5, 6 and 7. Created wget tracking bugs for this issue: Affects: fedora-all [bug 1662833] curl seems to have a similar issue, filed an upstream bug at: https://github.com/curl/curl/issues/3423 except that in curl storage of extended attributes is disabled by default and needs to be explicitly enabled by passing the --xattr command line argument. Mitigation: wget users should pass credentials using the "--user/password" or the "--user/--ask-password" command line argument to wget or use --no-xattr to turn off saving extended attribute information. In curl downloading extended attributes is disabled by default. Created curl tracking bugs for this issue: Affects: fedora-all [bug 1662852] (In reply to Huzaifa S. Sidhpurwala from comment #9) > curl seems to have a similar issue, filed an upstream bug at: > https://github.com/curl/curl/issues/3423 ... and here is the corresponding pull request at curl upstream: https://github.com/curl/curl/pull/3433 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2019:3701 https://access.redhat.com/errata/RHSA-2019:3701 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2018-20483 |