SB2019051020 - NULL pointer dereference in hostapd (Alpine package)

Description

This security bulletin contains information about 1 security vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2019-11555)

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

The vulnerability exists due to a NULL pointer dereference error in hostapd (EAP server) before 2.8 and wpa_supplicant (EAP peer) before 2.8 does not validate fragmentation reassembly state properly for a case where an unexpected fragment could be received. This could result in process termination due to a NULL pointer dereference (denial of service). This affects eap_server/eap_server_pwd.c and eap_peer/eap_pwd.c. A remote attacker can perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://git.alpinelinux.org/aports/commit/?id=cd144136ad59f95ca2d962cbf6014b0378af8fd9
• https://git.alpinelinux.org/aports/commit/?id=f1fd2a573425793de610a615092f210f1c50f0ad
• https://git.alpinelinux.org/aports/commit/?id=031621e2cf39f9441cb620e4ebfb5261276e7978
• https://git.alpinelinux.org/aports/commit/?id=3cd64c67f1c3365cc8ae201d0206327198d4b5a7
• https://git.alpinelinux.org/aports/commit/?id=904e2d699295d64fe5097fc46a9c6719fe26dc7a
• https://git.alpinelinux.org/aports/commit/?id=41b28e3b3b465fa8dab151dbe5e40975f014421b
• https://git.alpinelinux.org/aports/commit/?id=4b95dd4491b9df33d3c835de96f56aa076b00de7
• https://git.alpinelinux.org/aports/commit/?id=71e80d98081071b4d10324039fe65145316ec81c
• https://git.alpinelinux.org/aports/commit/?id=5e5822d55734bcd1be8d9bd61f1360af2fd9459e
• https://git.alpinelinux.org/aports/commit/?id=7da74780cb6ede70d4440b97f6a5878065b52889
• https://git.alpinelinux.org/aports/commit/?id=8caec8957d86cbdfe758cbfba62dcb1b73514bc9
• https://git.alpinelinux.org/aports/commit/?id=ef10b27afb6ce933891b3e0abf3f090f3e583900
• https://git.alpinelinux.org/aports/commit/?id=43c8f8a8f1a15295d3639577e4b8d50292b28225