A security vulnerability, identified as CVE-2023-29087, has been discovered in Samsung Exynos Mobile Processors, Automotive Processors, and Modems. This vulnerability affects devices equipped with Exynos Modem 5123, Exynos Modem 530, Exynos 980, Exynos 108, Exynos 911, and Exynos Auto T5123. The flaw can lead to memory corruption due to insufficient validation of parameters while decoding an SIP (Session Initiation Protocol) Retry-After header.

Vulnerability Details

The Session Initiation Protocol (SIP) is a signaling protocol for initiating, maintaining, modifying, and terminating real-time sessions that involve video, voice, messaging, and other communications. SIP Retry-After header is used for specifying how long the user agent should wait before issuing the retried request.

The vulnerability in question (CVE-2023-29087) deals with insufficient validation of parameters during the decoding process of the SIP Retry-After header. This could lead to memory corruption and induce further security risks and defects, such as denial of service, unauthorized access to critical data, or other undesired outcomes.

Exploit Code Snippet

The following is a potential code snippet that might resemble the vulnerable code processing SIP Retry-After header:

void process_sip_header(char *header) {
    char *retry_after_c = strstr(header, "Retry-After: ");
    if (retry_after_c != NULL) {
        int retry_after = atoi(retry_after_c + 12);

The issue with the code above is that it doesn't correctly validate the 'Retry-After' value extracted from the SIP header. An attacker could exploit this behavior by injecting a malformed Retry-After value that would trigger the memory corruption.

1. NVD - CVE-2023-29087
2. Samsung Exynos Official Website
3. Session Initiation Protocol (SIP) - RFC 3261
4. SIP Retry-After Header Specification - RFC 3261 Section 20.33

Apply security patches and updates provided by Samsung as soon as they become available.

2. Properly validate input parameters for SIP Retry-After header decoding to avoid potential memory corruption.


The CVE-2023-29087 vulnerability poses a significant risk to users and networks leveraging Samsung Exynos-based devices, as it could result in memory corruption and impact the stability and security of such devices. Users and administrators are encouraged to stay informed about security patches provided by Samsung and apply them accordingly to mitigate this risk. Careful attention should also be given to input validation procedures and appropriate monitoring for potential exploitation attempts.


Published on: 04/14/2023 21:15:00 UTC
Last modified on: 04/24/2023 16:51:00 UTC