Buffer overflow in heimdal (Alpine package)

1) Buffer overflow

EUVDB-ID: #VU3031

Risk: Critical

CVSSv4.0: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red]

CVE-ID: CVE-2011-4862

CWE-ID: CWE-119 - Memory corruption

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to buffer overflow in the encrypt_keyid() function of telnetd. A remote attacker can send a very large encryption key to telnetd daemon, trigger buffer overflow and execute arbitrary code with root privileges.

Successful exploitation of the vulnerability results in arbitrary code execution on the vulnerable system.

Note: the vulnerability was being actively exploited.

Mitigation

Install update from vendor's website.

Vulnerable software versions

heimdal (Alpine package): 1.3.3-r2

CPE2.3

• cpe:2.3:a:alpine:heimdal_alpine_package:1.3.3-r2:*:*:*:*:alpine_linux:*:2.1

External links

https://git.alpinelinux.org/aports/commit/?id=77e78b8f7202366649fb6f10196a767c3d0ce3b3
https://git.alpinelinux.org/aports/commit/?id=bb7500d2700767ec6df3fe37b9f75dc53bc91347
https://git.alpinelinux.org/aports/commit/?id=f81ee55cee797b4203340cebc3f15691ac93faeb

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, a fully functional exploit for this vulnerability is available.