Bug 2161271 (CVE-2022-41720)
| Summary: | CVE-2022-41720 golang: os, net/http: avoid escapes from os.DirFS and http.Dir on Windows | ||
|---|---|---|---|
| Product: | [Other] Security Response | Reporter: | Avinash Hanwate <ahanwate> |
| Component: | vulnerability | Assignee: | Nobody <nobody> |
| Status: | NEW --- | QA Contact: | |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | unspecified | CC: | aazores, abishop, amackenz, amasferr, amctagga, ansmith, aoconnor, asm, bbaude, bbuckingham, bcl, bcoca, bcourt, bdettelb, bkundu, bniver, bodavis, chazlett, davidn, dbenoit, debarshir, desktop-qa-list, dwalsh, dymurray, eaguilar, ebaron, eglynn, ehelms, ellin, emachado, epacific, fdeutsch, flucifre, gmeno, gparvin, grafana-maint, ibolton, jaharrin, jburrell, jcammara, jcantril, jchui, jeder, jhardy, jjoyce, jkang, jkurik, jligon, jmatthew, jmontleo, jneedle, jnovy, jobarker, joelsmith, jpallich, jross, jscholz, jsherril, jwendell, jwon, lball, lhh, lmadsen, lsm5, lzap, mabashia, matzew, mbenjamin, mboddu, mburns, mgarciac, mhackett, mheon, mhulan, mkudlej, mmagr, mrunge, mwringe, nathans, nboldt, njean, nmoumoul, nobody, opohorel, orabin, oramraz, osapryki, osbuilders, oskutka, owatkins, pahickey, pcreech, pehunt, periklis, pjindal, pthomas, rcernich, rchan, rgarg, rhcos-sst, rhos-maint, rhuss, saroy, scorneli, sfroberg, sgott, shbose, simaishi, sipoyare, slucidi, smcdonal, smullick, sostapov, spower, sseago, stcannon, swoodman, teagle, tjochec, tstellar, tsweeney, twalsh, ubhargav, umohnani, vereddy, whayutin, yguenane, ytale, zsadeh |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: |
A flaw was found in OS, net/http golang library. In Windows, restricted files can be accessed via os.DirFS and http.Dir. The os.DirFS function and http.Dir type provide access to a tree of files rooted in a given directory. These functions permit access to Windows device files under that root. For example, os.DirFS("C:/tmp").Open("COM1") opens the COM1 device. Both os.DirFS and http.Dir only provide read-only filesystem access. In addition, on Windows, an os.DirFS for the directory (the root of the current drive) can permit a maliciously crafted path to escape from the drive and access any path on the system. With the fix applied, the behavior of os.DirFS("") has changed. Previously, an empty root was treated equivalently to "/", so os.DirFS("").Open("tmp") would open the path "/tmp". This now returns an error.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 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: | 2161431, 2161432 | ||
| Bug Blocks: | 2161276 | ||
Created golang tracking bugs for this issue: Affects: epel-all [bug 2161431] Affects: fedora-all [bug 2161432] |
On Windows, restricted files can be accessed via os.DirFS and http.Dir. The os.DirFS function and http.Dir type provide access to a tree of files rooted at a given directory. These functions permit access to Windows device files under that root. For example, os.DirFS("C:/tmp").Open("COM1") opens the COM1 device. Both os.DirFS and http.Dir only provide read-only filesystem access. In addition, on Windows, an os.DirFS for the directory (the root of the current drive) can permit a maliciously crafted path to escape from the drive and access any path on the system. With fix applied, the behavior of os.DirFS("") has changed. Previously, an empty root was treated equivalently to "/", so os.DirFS("").Open("tmp") would open the path "/tmp". This now returns an error. https://groups.google.com/g/golang-announce/c/L_3rmdT0BMU/m/yZDrXjIiBQAJ https://pkg.go.dev/vuln/GO-2022-1143 https://go.dev/cl/455716 https://go.dev/issue/56694