SB2018012517 - Ubuntu update for Libtasn1
Published: January 25, 2018
Security Bulletin ID
SB2018012517
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Remote access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Null pointer dereference (CVE-ID: CVE-2017-10790)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists in the _asn1_check_identifier function in GNU Libtasn1 due to insufficient validation of user-supplied input. A remote attacker can submit a specially crafted input, trigger assignment of a NULL value within an asn1_node structure and cause the service to crash.
2) Resource exhaustion (CVE-ID: CVE-2018-6003)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a remote attacker to cause DoS condition on the target system.
The weakness exists in the _asn1_decode_simple_ber function in decoding.c in GNU Libtasn1. A remote attacker can trigger unlimited recursion in the BER decoder and stack exhaustion to cause the service to crash.
Remediation
Install update from vendor's website.