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

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Main Vulnerability Database Vulnerabilities #VU31746

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

Published: July 22, 2020 / Updated: August 17, 2020


Vulnerability identifier: #VU31746
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2020-10756
CWE-ID: CWE-125
Exploitation vector: Adjecent network
Exploit availability: No public exploit available

Vulnerability details

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.


Affected software

libslirp
Debian Linux
Red Hat Enterprise Linux for ARM 64
Fedora
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat Enterprise Linux Server - TUS
Opensuse
Ubuntu
Red Hat Enterprise Linux Advanced Virtualization
libslirp (Alpine package)
libslirp0 (Ubuntu package)
qemu-system-x86 (Ubuntu package)
qemu-system-sparc (Ubuntu package)
qemu-system (Ubuntu package)
qemu (Ubuntu package)
qemu-system-s390x (Ubuntu package)
qemu-system-ppc (Ubuntu package)
qemu-system-mips (Ubuntu package)
libslirp
qemu (Debian package)

How to mitigate CVE-2020-10756

Install updates from vendor's website.

libslirp - update to 4.3.1
libslirp (Alpine package) - update to 4.3.1-r0
libslirp0 (Ubuntu package) - update to 4.1.0-2ubuntu2.1
qemu-system-x86 (Ubuntu package) - update to 1:2.11+dfsg-1ubuntu7.31
qemu-system-sparc (Ubuntu package) - update to 1:2.11+dfsg-1ubuntu7.31
qemu-system (Ubuntu package) - update to 1:2.11+dfsg-1ubuntu7.31
qemu (Ubuntu package) - update to 1:2.11+dfsg-1ubuntu7.31
qemu-system-s390x (Ubuntu package) - update to 1:2.11+dfsg-1ubuntu7.31
qemu-system-ppc (Ubuntu package) - update to 1:2.11+dfsg-1ubuntu7.31
qemu-system-mips (Ubuntu package) - update to 1:2.11+dfsg-1ubuntu7.31
libslirp - addressed in versions 4.3.1-1.el8, 4.3.1-1.fc32
qemu (Debian package) - update to 1:3.1+dfsg-8+deb10u6

External References

Related Security Bulletins