various: Stack-based Buffer Overflow
CVE-2023-50734 is a critical-severity stack-based buffer overflow vulnerability in various from Lexmark, with a CVSS 3.1 base score of 9.0 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected various versions: various. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.77% chance of exploitation within 30 days, higher than 56% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of various you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on lexmark.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Lexmark | various | various | Not stated |
| Lexmark | cxtpc_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | cstpc_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | mxtct_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | mxtpm_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | cxtmm_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | mslsg_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | mxlsg_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | mslbd_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | mxlbd_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | msngm_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | mstgm_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | mxngm_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | ms315 | lw90.tl2.p205 and earlier | Not stated |
| Lexmark | ms610dn | lw90.pr2.p205 and earlier | Not stated |
| Lexmark | mxtgm_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | msngw_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | mstgw_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | mxtgw_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | cslbn_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | cslbl_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | cxlbn_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | cxlbl_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | cstzj_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
| Lexmark | csnzj_firmware | 230.041 and earlier; 230.075 through 230.078; 230.200 through 230.203 | Not stated |
Version data comes from the organisation that assigned the CVE; 35 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- HighSuccess depends on conditions outside the attacker's control.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- ChangedThe attack can reach beyond the vulnerable component into other systems.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H. Scored by CNA.
Official description
A buffer overflow vulnerability has been identified in PostScript interpreter in various Lexmark devices. The vulnerability can be leveraged by an attacker to execute arbitrary code.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Stack-based Buffer Overflow
The product writes past the end of a buffer that was allocated on the stack.
How developers prevent this class of flaw
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking. D3-SFCV (Stack Frame Canary Validation) from D3FEND discusses canary-based detection in detail.
- Use an abstraction library to abstract away risky APIs. Not a complete solution.
- Implement and perform bounds checking on input.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in various
- 9.1 Critical severity
- 9.0 Critical severity
- 9.0 Critical severity
Recent Stack-based Buffer Overflow vulnerabilities
- 9.8 Critical severity
- 9.8 Critical severity
- 8.0 High severity
- 8.8 High severity
- 8.8 High severity
- 8.8 High severity
Spotted an error? Tell us.