SB2017113004 - Multiple vulnerabilities in libcurl

Description

This security bulletin contains information about 3 secuirty vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2017-8816)

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

The vulnerability exists due to buffer overflow in the NTLM authentication process. A remote unauthenticated attacker can use vectors involving long user and password fields, trigger memory corruption and execute arbitrary code with privileges of the current user.

Successful exploitation of the vulnerability may result in system compromise.

2) Out-of-bounds read (CVE-ID: CVE-2017-8817)

The vulnerability allows a remote attacker to redirect the target client to an arbitrary site.

The vulnerability exists due to out-of-bounds read in the FTP wildcard function (CURLOPT_WILDCARDMATCH). A remote unauthenticated attacker can use a string that ends with an '[' character, trigger out-of-bounds read and cause the target connected libcurl client to be redirected.

3) Denial of service (CVE-ID: CVE-2017-8818)

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The vulnerability exists due to too little memory is allocated for interfacing to an SSL library. A remote attacker can trigger a memory allocation error in SSL-related code and cause the application to crash.

Remediation

Install update from vendor's website.

References

• https://curl.haxx.se/docs/adv_2017-12e7.html
• https://curl.haxx.se/docs/adv_2017-ae72.html
• https://curl.haxx.se/docs/adv_2017-af0a.html