SB2017081008 - Information disclosure in cURL

Description

This security bulletin contains information about 3 vulnerabilities.

1) Out-of-bounds read (CVE-ID: CVE-2017-1000099)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local attacker to obtain potentially sensitive information.

The weakness exists due to out-of bounds read. A local attacker can load a specially crafted 'file://' URL to cause the curl application to return data from system memory.

Successful exploitation of the vulnerability results in information disclosure.

2) Out-of-bounds read (CVE-ID: CVE-2017-1000101)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to redirect website visitors to external websites.

The weakness exists due to out-of-bounds read. A local user can supply a URL containing specially crafted numerical range characters to trigger a heap read error and obtain potentially sensitive information from system memory

Successful exploitation of the vulnerability results in information disclosure.

3) Open redirect (CVE-ID: CVE-2017-1000100)

CWE-ID: CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to redirect website visitors to external websites.

The weakness exists due to incorrect validation of redirected URL. A remote attacker can redirect the target user's curl request to a TFTP URL with a long filename to cause the target user's curl application to send portions of system memory.

Successful exploitation of the vulnerability results in information disclosure.

Remediation

Install update from vendor's website.

References

• https://curl.haxx.se/docs/adv_20170809C.html
• https://curl.haxx.se/docs/adv_20170809A.html
• https://curl.haxx.se/docs/adv_20170809B.html