Vulnerability Details : CVE-2020-15173
In ACCEL-PPP (an implementation of PPTP/PPPoE/L2TP/SSTP), there is a buffer overflow when receiving an l2tp control packet ith an AVP which type is a string and no hidden flags, length set to less than 6. If your application is used in open networks or there are untrusted nodes in the network it is highly recommended to apply the patch. The problem was patched with commit 2324bcd5ba12cf28f47357a8f03cd41b7c04c52b As a workaround changes of commit 2324bcd5ba12cf28f47357a8f03cd41b7c04c52b can be applied to older versions.
Vulnerability category: Overflow
Exploit prediction scoring system (EPSS) score for CVE-2020-15173
Probability of exploitation activity in the next 30 days: 0.36%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 69 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2020-15173
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
|
8.2
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H |
3.9
|
4.2
|
GitHub, Inc. |
CWE ids for CVE-2020-15173
-
The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.Assigned by: security-advisories@github.com (Secondary)
-
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-15173
-
https://github.com/accel-ppp/accel-ppp/security/advisories/GHSA-rr68-fchr-69vf
A possible heap buffer overflow when receiving an l2tp control packet with an AVP which type is a string and no hidden flags, length set to less than 6 · Advisory · accel-ppp/accel-ppp · GitHubThird Party Advisory
-
https://github.com/accel-ppp/accel-ppp/commit/2324bcd5ba12cf28f47357a8f03cd41b7c04c52b
l2tp: fix RCE through buffer overflow & fix LE/BE compatibility · accel-ppp/accel-ppp@2324bcd · GitHubPatch;Third Party Advisory
Products affected by CVE-2020-15173
- cpe:2.3:a:accel-ppp:accel-ppp:*:*:*:*:*:*:*:*