#VU31746 Out-of-bounds read in libslirp - CVE-2020-10756

Vulnerability identifier: #VU31746

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-10756

CWE-ID: CWE-125

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
libslirp
Universal components / Libraries / Libraries used by multiple products

Vendor: Freedesktop.org

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in the "icmp6_send_echoreply()" routine while replying to an ICMP echo request. A remote attacker with access to guest operating system can trigger out-of-bounds read error and read contents of memory on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

libslirp: 4.0.0 - 4.3.0

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External links
https://lists.opensuse.org/opensuse-security-announce/2020-07/msg00035.html
https://lists.opensuse.org/opensuse-security-announce/2020-07/msg00040.html
https://bugzilla.redhat.com/show_bug.cgi?id=1835986
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JYTZ32P67PZER6P7TW6FQK3SZRKQLVEI/
https://www.debian.org/security/2020/dsa-4728
https://www.zerodayinitiative.com/advisories/ZDI-20-1005/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.