Denial of service in libslirp



Published: 2020-04-28
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2020-1983
CWE-ID CWE-416
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe 		libslirp
Universal components / Libraries / Libraries used by multiple products

Vendor Freedesktop.org

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Use-after-free

EUVDB-ID: #VU27389

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2020-1983

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a use-after-free error when processing packets within the ip_reass() function in ip_input.c in libslirp. A remote attacker can send a specially crafted packet to the application, trigger a use-after-free error and crash it.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

libslirp: 3.0.0 - 4.2.0

External links

http://gitlab.freedesktop.org/slirp/libslirp/-/commit/9ac0371bb8c0a40f5d9f82a1c25129660e81df04
http://gitlab.freedesktop.org/slirp/libslirp/-/issues/20


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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