SB2017091710 - Gentoo update for cURL
Published: September 17, 2017 Updated: September 18, 2017
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Out-of-bounds read (CVE-ID: CVE-2017-1000099)
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) Open redirect (CVE-ID: CVE-2017-1000100)
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.
3) Out-of-bounds read (CVE-ID: CVE-2017-1000101)
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.
4) Buffer overflow (CVE-ID: CVE-2017-7407)
The vulnerability allows a local non-authenticated attacker to gain access to sensitive information.
The ourWriteOut function in tool_writeout.c in curl 7.53.1 might allow physically proximate attackers to obtain sensitive information from process memory in opportunistic circumstances by reading a workstation screen during use of a --write-out argument ending in a '%' character, which leads to a heap-based buffer over-read.
5) Improper Certificate Validation (CVE-ID: CVE-2017-7468)
The vulnerability allows a remote non-authenticated attacker to manipulate data.
In curl and libcurl 7.52.0 to and including 7.53.1, libcurl would attempt to resume a TLS session even if the client certificate had changed. That is unacceptable since a server by specification is allowed to skip the client certificate check on resume, and may instead use the old identity which was established by the previous certificate (or no certificate). libcurl supports by default the use of TLS session id/ticket to resume previous TLS sessions to speed up subsequent TLS handshakes. They are used when for any reason an existing TLS connection couldn't be kept alive to make the next handshake faster. This flaw is a regression and identical to CVE-2016-5419 reported on August 3rd 2016, but affecting a different version range.
Remediation
Install update from vendor's website.