libcss through 0.9.2 contains a NULL pointer dereference vulnerability in mq_parse_media_query() that allows remote attackers to crash consumers by supplying media lists ending in a comma. Attackers can serve a stylesheet whose @media or @import media list has a trailing comma, causing NetSurf or other parsers to crash.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
Passive
Minimal interaction
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 5
https://github.com/netsurf-browser/libcss
disclosure@vulncheck.com
https://github.com/netsurf-browser/libcss/blob/release/0.9.2/src/parse/mq.c#L984
disclosure@vulncheck.com
https://github.com/netsurf-browser/libcss/commit/006ffc4096040da13690abc380e5f8…
disclosure@vulncheck.com
https://hackmd.io/@haindpwn/libcss-media-list-null-deref
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/libcss-through-0.9.2-null-pointer-derefere…
disclosure@vulncheck.com