CVE-2020-7211
published 2020-01-21CVE-2020-7211: tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory traversal on Windows.
PriorityP340high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
4.14%
89.7th percentile
tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory traversal on Windows.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | libslirp | — | — |
| libslirp_project | libslirp | — | — |
| msrc | cbl_mariner_1.0_arm | — | — |
| msrc | cbl_mariner_1.0_x64 | — | — |
| msrc | cm1_qemu-kvm_4.2.0-13_on_cbl_mariner_1.0 | — | — |
| qemu | qemu | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
nvdv2.05.0MEDIUMAV:N/AC:L/Au:N/C:P/I:N/A:N
osv7.5HIGH
vendor_debian7.5LOW
vendor_msrc7.5HIGH
vendor_redhat7.5HIGH
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Microsoft
tftp.c in libslirp 4.1.0 as used in QEMU 4.2.0 does not prevent ..\ directory traversal on Windows.
vendor_msrc·2020-01-14·CVSS 7.5
CVE-2020-7211 [HIGH] CWE-22 tftp.c in libslirp 4.1.0 as used in QEMU 4.2.0 does not prevent ..\ directory traversal on Windows.
tftp.c in libslirp 4.1.0 as used in QEMU 4.2.0 does not prevent ..\ directory traversal on Windows.
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
mitre: mitre
Customer Action Required: Yes
Remediation: CB
Debian
CVE-2020-7211: libslirp - tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory ...
vendor_debian·2020·CVSS 7.5
CVE-2020-7211 [HIGH] CVE-2020-7211: libslirp - tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory ...
tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory traversal on Windows.
Scope: local
bookworm: open
bullseye: open
forky: open
sid: open
trixie: open
Red Hat
QEMU: Slirp: potential directory traversal using relative paths via tftp server on Windows host
vendor_redhat·2019-12-30·CVSS 7.5
CVE-2020-7211 [HIGH] CWE-22 QEMU: Slirp: potential directory traversal using relative paths via tftp server on Windows host
QEMU: Slirp: potential directory traversal using relative paths via tftp server on Windows host
tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory traversal on Windows.
A potential directory traversal issue was found in the tftp server of the SLiRP user-mode networking implementation used by QEMU. It could occur on a Windows host, as it allows the use of both forward ('/') and backward slash('\') tokens as separators in a file path. A user able to access the tftp server could use this flaw to access undue files by using relative paths.
Statement: This issue affects user-mode or SLiRP networking implementation of the QEMU emulator. Though qemu-kvm package is built with SLiRP networking support, due to its limitations, it is not used by the virtual machine gue
GHSA
GHSA-g6ww-98w5-h2gm: tftp
ghsa_unreviewed·2022-05-24
CVE-2020-7211 [MEDIUM] GHSA-g6ww-98w5-h2gm: tftp
tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory traversal on Windows.
OSV
CVE-2020-7211: tftp
osv·2020-01-21·CVSS 7.5
CVE-2020-7211 [HIGH] CVE-2020-7211: tftp
tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory traversal on Windows.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2020-7211 qemu: Slirp: potential directory traversal using relative paths via tftp server on Windows host [fedora-all]
bugzilla·2020-01-17·CVSS 7.5
CVE-2020-7211 [HIGH] CVE-2020-7211 qemu: Slirp: potential directory traversal using relative paths via tftp server on Windows host [fedora-all]
CVE-2020-7211 qemu: Slirp: potential directory traversal using relative paths via tftp server on Windows host [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: t
Bugzilla
CVE-2020-7211 QEMU: Slirp: potential directory traversal using relative paths via tftp server on Windows host
bugzilla·2020-01-17·CVSS 7.5
CVE-2020-7211 [HIGH] CVE-2020-7211 QEMU: Slirp: potential directory traversal using relative paths via tftp server on Windows host
CVE-2020-7211 QEMU: Slirp: potential directory traversal using relative paths via tftp server on Windows host
A potential directory traversal issue was found in the tftp server
of the SLiRP user-mode networking implementation used by QEMU.
It could occur on Windows host, as it allows to use both forward ('/')
and backward slash('\') tokens as separators in a file path.
A user able to access the tftp server could use this flaw to access
undue files by using relative paths.
Upstream patch:
-> https://gitlab.freedesktop.org/slirp/libslirp/commit/14ec36e107a8c9af7d0a80c3571fe39b291ff1d4
Reference:
-> https://www.openwall.com/lists/oss-security/2020/01/17/2
Discussion:
Created qemu tracking bugs for this issue:
Affects: fedora-all [bug 1792132]
---
External References:
https://www.voi
http://www.openwall.com/lists/oss-security/2020/01/17/2https://gitlab.freedesktop.org/slirp/libslirp/commit/14ec36e107a8c9af7d0a80c3571fe39b291ff1d4https://security-tracker.debian.org/tracker/CVE-2020-7211http://www.openwall.com/lists/oss-security/2020/01/17/2https://gitlab.freedesktop.org/slirp/libslirp/commit/14ec36e107a8c9af7d0a80c3571fe39b291ff1d4https://security-tracker.debian.org/tracker/CVE-2020-7211
2020-01-21
Published