SB2017112941 - Buffer overflow in shadow (Alpine package)

Description

This security bulletin contains information about 1 vulnerability.

1) Buffer overflow (CVE-ID: CVE-2017-12424)

CWE-ID: CWE-119 - Memory corruption

CVSSv4: 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:U/U:Amber

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

In shadow before 4.5, the newusers tool could be made to manipulate internal data structures in ways unintended by the authors. Malformed input may lead to crashes (with a buffer overflow or other memory corruption) or other unspecified behaviors. This crosses a privilege boundary in, for example, certain web-hosting environments in which a Control Panel allows an unprivileged user account to create subaccounts.

Remediation

Install update from vendor's website.

References

• https://git.alpinelinux.org/aports/commit/?id=268b69b781cc266d5eaafc5b4fd4a2ca9d54c2d9
• https://git.alpinelinux.org/aports/commit/?id=fe20e8da2f8b7fb6f208cccf8f369400d947a6a2