Multiple vulnerabilities that affect FreeBSD's implementation of IPSec's Authentication Header (AH) protocol have been fixed in Juniper Networks Junos OS.
These issues only affect systems configured for IPsec when the AH protocol is used.
These issues allow an attacker from a trusted host to potentially be able to take control of the device by sending a specifically constructed IP packet that may lead to a system crash. Additionally, an attacker from any host may crash the target by sending an arbitrary packet to the device causing a Denial of Service (DoS). Sustained receipt of these specifically constructed or arbitrary packets will result in an extended Denial of Service condition.
Devices not configured for IPsec AH use are not exploitable to these issues.
These issues affect:
Juniper Networks Junos OS
15.1 versions prior to 15.1R7-S6;
15.1X49 versions prior to 15.1X49-D200 on SRX Series;
15.1X53 versions prior to 15.1X53-D593 on EX2300, EX3400;
16.1 versions prior to 16.1R7-S7;
16.2 versions prior to 16.2R2-S11;
17.1 versions prior to 17.1R2-S11, 17.1R3-S2;
17.2 versions prior to 17.2R3-S3;
17.2X75 versions prior to 17.2X75-D44, 17.2X75-D105, 17.2X75-D110;
17.3 versions prior to 17.3R2-S5, 17.3R3-S7;
17.4 versions prior to 17.4R2-S9, 17.4R3;
18.1 versions prior to 18.1R3-S9;
18.2 versions prior to 18.2R2-S6, 18.2R3-S3;
18.2X75 versions prior to 18.2X75-D33, 18.2X75-D60, 18.2X75-D411, 18.2X75-D420;
18.3 versions prior to 18.3R1-S7, 18.3R2-S3, 18.3R3-S1;
18.4 versions prior to 18.4R1-S5, 18.4R2-S3, 18.4R3;
19.1 versions prior to 19.1R1-S4, 19.1R2, 19.1R3;
19.2 versions prior to 19.2R1-S2, 19.2R2;
19.3 versions prior to 19.3R1-S1, 19.3R2, 19.3R3.
These issues do not affect Junos OS prior to 15.1R1.
These issues exist where the ah protocol is configured or in use.
One example of one minimal configuration is the "manual" IPSec SA configuration:
security ipsec security-association <sa-name> manual direction <direction> protocol ah
Other configurations apply.
Juniper SIRT is not aware of any malicious exploitation of these vulnerabilities.
These issues were discovered during an external security research.
The following software releases have been updated to resolve these specific issues: 15.1R7-S6, 15.1X49-D200, 15.1X53-D593, 16.1R7-S7, 16.2R2-S11, 17.1R2-S11, 17.1R3-S2, 17.2R3-S3, 17.2X75-D44, 17.2X75-D105, 17.2X75-D110, 17.3R2-S5, 17.3R3-S7, 17.4R2-S9, 17.4R3, 18.1R3-S9, 18.2R2-S6, 18.2R3-S3, 18.2X75-D33, 18.2X75-D60, 18.2X75-D411, 18.2X75-D420, 18.3R1-S7, 18.3R2-S3, 18.3R3-S1, 18.4R1-S5, 18.4R2-S3, 18.4R3, 19.1R1-S4, 19.1R2, 19.1R3, 19.2R1-S2, 19.2R2, 19.3R1-S1, 19.3R2, 19.3R3, 19.4R1, and all subsequent releases.
These issues are being tracked as 1470693 .
Software Releases, patches and updates are available at https://www.juniper.net/support/downloads/ .
There are no known workarounds for AH-only configurations.
Customers may configure ESP instead of AH as it may be configured for both confidentiality and integrity.
Note: You can configure encryption when AH is not in use.
2020-04-08: Initial publication