Description
zlib 1.2.11 through 1.3.2 contains a heap buffer overflow: after an underlying write() fails, gz_write() returns without resetting strm.next_in, leaving it pointed at the caller's buffer. A later gz* write call then derives a position from the stale pointer and writes past a heap allocation; any write() failure reaches it, including EPIPE on a blocking descriptor, and in versions before 1.3.1.2 the failed write must be followed by a gzclearerr() call.
CVSS breakdown
CVSS 4.0
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
Passive
Confidentiality (Vulnerable System)
High
Integrity (Vulnerable System)
None
Availability (Vulnerable System)
None
Confidentiality (Subsequent System)
High
Integrity (Subsequent System)
None
Availability (Subsequent System)
None
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
Affected products
- webpack / webpack-dev-middleware5.3.4 – 5.3.4
- webpack / webpack-dev-middleware6.1.2 – 6.1.3
- webpack / webpack-dev-middleware7.1.0 – 7.4.5
- webpack / webpack-dev-middleware8.0.0 – 8.1.1
- zlib / zlib1.2.11 – 1.3.2
References
- MISChttps://gist.github.com/thesmartshadow/e0b9481792afb7c31e86fee1ff084490
- PATCHhttps://github.com/madler/zlib/commit/df84af25dc1942490e1d1c899a07619152a46148
- MISChttps://github.com/madler/zlib/blob/v1.3.2/gzwrite.c#L393
- MISChttps://github.com/madler/zlib
- VENDOR_ADVISORYhttps://www.vulncheck.com/advisories/zlib-1.3.1.2-through-1.3.2-heap-buffer-overflow-via-gz-vacate
Updated 40m ago · 8 sources