SB2016123023 - Improper Certificate Validation in curl (Alpine package)
Published: December 30, 2016
Security Bulletin ID
SB2016123023
Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper Certificate Validation (CVE-ID: CVE-2016-9952)
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
The verify_certificate function in lib/vtls/schannel.c in libcurl 7.30.0 through 7.51.0, when built for Windows CE using the schannel TLS backend, makes it easier for remote attackers to conduct man-in-the-middle attacks via a crafted wildcard SAN in a server certificate, as demonstrated by "*.com."
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=7079fe21530ae1c8147925d8b591131b786ab2e9
- https://git.alpinelinux.org/aports/commit/?id=619d9f8608068fab555a9a54e6154eb798eb5c2c
- https://git.alpinelinux.org/aports/commit/?id=09397ff9b9dd0d5668c3eac94b18bf725cc0cb0d
- https://git.alpinelinux.org/aports/commit/?id=8a5e3005b1e698bb2e3052f1ed638086620775f7
- https://git.alpinelinux.org/aports/commit/?id=3aa892ac421bfd2d826eae84932f3edcbfade015