SB2021071532 - Ubuntu update for libslirp

Description

This security bulletin contains information about 6 secuirty vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2020-29129)

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

The vulnerability exists due to buffer over-read in ncsi.c when processing ARP/NCSI packets in 'arp_input' or 'ncsi_input' routines, because the libslirp library tries to read a certain amount of header data even if that exceeds the total packet length. A remote attacker can perform a denial of service attack.

2) Out-of-bounds read (CVE-ID: CVE-2020-29130)

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

The vulnerability exists due to buffer over-read in slirp.c when processing ARP/NCSI packets in 'arp_input' or 'ncsi_input' routines, because the libslirp library tries to read a certain amount of header data even if that exceeds the total packet length. A remote attacker can perform a denial of service attack.

3) Release of invalid pointer or reference (CVE-ID: CVE-2021-3592)

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

The vulnerability exists due to invalid pointer initialization within the bootp_input() function while processing UDP packets in the SLiRP networking implementation of QEMU. A malicious guest could use this flaw to leak 10 bytes of uninitialized heap memory from the host.

4) Release of invalid pointer or reference (CVE-ID: CVE-2021-3593)

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

The vulnerability exists due to invalid pointer initialization within the udp6_input() function while processing UDP packets in the SLiRP networking implementation of QEMU. A malicious guest could use this vulnerability to read host memory.

5) Release of invalid pointer or reference (CVE-ID: CVE-2021-3594)

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

The vulnerability exists due to invalid pointer initialization within the udp_input() function while processing UDP packets in the SLiRP networking implementation of QEMU. A malicious guest could use this vulnerability to read host memory.

6) Release of invalid pointer or reference (CVE-ID: CVE-2021-3595)

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

The vulnerability exists due to invalid pointer initialization within the tftp_input() function while processing UDP packets in the SLiRP networking implementation of QEMU. A malicious guest could use this vulnerability to read host memory.

Remediation

Install update from vendor's website.

References

• https://ubuntu.com/security/notices/USN-5009-1