SB2018041918 - Slackware Linux update for gd
Published: April 19, 2018
Security Bulletin ID
SB2018041918
Severity
Low
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 secuirty vulnerabilities.
1) Double free memory error (CVE-ID: CVE-2017-6362)
The vulnerability allows a remote attacker to cause DoS condition on the target system.The weakness exists due to double free memory error in the gdImagePngPtr function. A remote attacker can submit vectors related to a palette with no colors and cause the service to crash.
2) Information disclosure (CVE-ID: CVE-2017-7890)
The vulnerability allows a remote attacker to obtain potentially sensitive information.
The weakness exists in the GIF decoding function gdImageCreateFromGifCtx in gd_gif_in.c due to it does not zero colorMap arrays before use. A remote attacker can trick the victim into opening a specially crafted GIF image that could use the uninitialized tables to read ~700 bytes from the top of the stack and gain access to potentially sensitive information.
Remediation
Install update from vendor's website.